May 99 Challenge

Volume Number: 15 (1999)
Issue Number: 5
Column Tag: Programmer's Challenge

# May 99 Challenge

by Bob Boonstra, Westford, MA

### Piper

Every once in a while, good fortune not only comes your way, but actually reaches out of your computer monitor, and grabs you by the throat. I felt a little like that while reading a recent issue of TidBITS. In it was a column by Rick Holzgrafe reflecting on the increasing speed of computers, in which Rick described a program he wrote for a PDP-11/60 to solve a word puzzle. The idea behind the puzzle was to take a phrase and map it onto a rectangular grid, with the objective being to map the phrase into a rectangle of the smallest possible area. The word puzzle looked like a good idea for a Challenge, and Rick and TidBITS agreed to let me use it.

In more detail, the puzzle works like this. To start, you are given a null-terminated string consisting of printable characters. You process the characters in order, ignoring any non-alphabetic characters and ignoring case. The first alphabetic character can be mapped to any square in the grid. The next letter can be mapped to any adjacent square, where adjacent is any of the eight neighboring squares in a horizontal, vertical, or diagonal direction. You may reuse a square if it is adjacent and already has the letter you are mapping. If the same letter occurs twice in a row in the input string, the letters must still be mapped to adjacent (but distinct) squares.

The prototype for the code you should write is:

```#if defined(__cplusplus)
extern "C" {
#endif

typedef struct GridPoint {
long x;
long y;
} GridPoint;

void Piper (
char *s,
GridPoint pt[]
);

#if defined(__cplusplus)
}
#endif
```

For example, your Piper routine might be provided with the string:

```            How much wood would a woodchuck chuck if a woodchuck
could chuck wood?
```

You might place the letters of that string into a 4x14 rectangle like:

```                  ULD  ADLU
HDOAIUCOHWUHOD
UCOWFKHDOMCWOW
K   WO
```

Or, you might compact them into an 4x4 rectangle:

```               HWMU
OOCH
UDWK
LAFI
```

You must return the GridPoint coordinates of where each character is mapped, with pt[i] containing the coordinates of input character s[i]. The origin of your coordinate system should be the cell where the first character is placed. The winner will be the solution that stores the input string in a rectangle of minimal area. Note that you are minimizing rectangle area, not the number of occupied squares. A time penalty of 1% for each second of execution time will be added

This will be a native PowerPC Challenge, using the latest CodeWarrior environment. Solutions may be coded in C, C++, or Pascal.

### Three Months Ago Winner

The February Challenge invited readers to write a player for the game of Chinese Checkers. Played on a hexagonal board with six appended triangles, Chinese Checkers pits between 2 and 6 players against one another, with the objective being to move one's pieces from the home triangle to the opposite triangle. In the traditional game, the home triangles are usually 3 or 4 positions on a side; the Challenge extended the game to triangles of up to 64 positions. Pieces can either be moved to an immediately adjacent position or jumped over an adjacent piece. A single piece is permitted to make a sequence of jumps in a single move.

As simple as the game sounds, readers found it to be very difficult, so difficult that no solutions were submitted for the Chinese Checkers Challenge. Which left Yours Truly in something of a difficult spot. I could stop the column at this point, which wouldn't be very interesting for readers, not to mention not very satisfying for the magazine. Or I could write a solution for the Challenge myself, something I haven't done since I retired from Competition four plus years ago. Somewhat against my better judgement, I selected the latter option.

The first thing I noticed in solving the Challenge was that the board coordinate system specified in the problem wasn't very useful in generating a solution. I needed a coordinate system that could be easily rotated in 60-degree increments, enabling my solution to play any of the six possible player positions. After some thought, I came up with a more symmetric coordinate system, called CanonPosition in the code, along with conversion routines ConvertPositionToCanonPosition and ConvertCanonPositionToPosition. The commentary in the code illustrates the coordinate system for a board of size 4. Then I needed a way to evaluate board positions. I decided on a simple metric that summed the distances of all pieces from the apex of their goal triangle. That metric could be improved upon by taking possible jump moves into account. The solution starts by computing all possible moves for our player. It then tries each of those moves, and then recursively calls MakeNextMove to process the next player. It computes and tries all moves for that player, and recurses for the next player. Recursion terminates when kMaxPlys turns have been taken for all players. Positions are evaluated using a min-max technique, where each player selects the position that maximizes his position relative to the best position of the other players.

The code could be improved in many ways. Instead of trying all possible positions, it could prune some obviously bad moves in the backward direction. This is complicated by the fact that some good jump multi-moves can include individual jumps that appear to be moving backward. The code might also be improved by evaluating moves by progressive deepening, rather than the depth-first search currently used, and by ordering move evaluation based on the scores at the prior depth. This technique is used in chess programs to prune the move tree to a manageable size. These and other optimizations are left to the reader. :-)

Remember, you can't win if you don't play. To ensure that you have as much time as possible to solve the Challenge, subscribe to the Programmer's Challenge mailing list. To subscribe, see the Challenge web page at <http://www.mactech.com/mactech/progchallenge/>. The Challenge is sent to the list around the 12th of the month before the solutions are due, often in advance of when the physical magazine is delivered.

Here is our sample Chinese Checkers solution:

#### Chinese Checkers.c Copyright © 1999 J. Robert Boonstra

```/*
*  Example solution for the February 1999 Programmer's Challenge
*
*  This solution is provided because no solutions were submitted
*  for the ChineseCheckers Challenge.  This solution leaves a
*  great deal to be desired: it is not optimized, it does not
*  prune prospective moves efficiently, and it does not employ
*  any of the classic alpha-beta techniques for efficiently
*  selecting a move.
*/

#include <stdio.h>
#include <stdlib.h>
#include <Quickdraw.h>

#include "ChineseCheckers.h"

/* Position coordinates specified in problem (size==4)

0:                           0
1:                         0   1
2:                      -1   0   1
3:                    -1   0   1   2
4:  -6  -5  -4  -3  -2  -1   0   1   2   3   4   5   6
5:    -5  -4  -3  -2  -1   0   1   2   3   4   5   6
6:      -5  -4  -3  -2  -1   0   1   2   3   4   5
7:        -4  -3  -2  -1   0   1   2   3   4   5
8:          -4  -3  -2  -1   0   1   2   3   4
9:        -4  -3  -2  -1   0   1   2   3   4   5
10:      -5  -4  -3  -2  -1   0   1   2   3   4   5
11:    -5  -4  -3  -2  -1   0   1   2   3   4   5   6
12:  -6  -5  -4  -3  -2  -1   0   1   2   3   4   5   6
13:                    -1   0   1   2
14:                      -1   0   1
15:                         0   1
16:                           0
*/

#define kMaxPlys 1
#define kEmpty -1

/* CanonPosition uses units with (0,0) at the middle of the board */
typedef struct CanonPosition {
long row;
long col;
} CanonPosition;

/* Canonical position coordinates (size==4)

-8:                           0
-7:                        -1   1
-6:                      -2   0   2
-5:                    -3  -1   1   3
-4: -12 -10  -8  -6  -4  -2   0   2   4   6   8  10  12
-3:   -11  -9  -7  -5  -3  -1   1   3   5   7   9  11
-2:     -10  -8  -6  -4  -2   0   2   4   6   8  10
-1:        -9  -7  -5  -3  -1   1   3   5   7   9
0:          -8  -6  -4  -2   0   2   4   6   8
1:        -9  -7  -5  -3  -1   1   3   5   7   9
2:     -10  -8  -6  -4  -2   0   2   4   6   8  10
3:   -11  -9  -7  -5  -3  -1   1   3   5   7   9  11
4: -12 -10  -8  -6  -4  -2   0   2   4   6   8  10  12
5:                    -3  -1   1   3
6:                      -2   0   2
7:                        -1   1
8:                           0
*/

/* PlayerPos is used to store the location of each of a players pieces */
typedef struct PlayerPos {
CanonPosition pos;
} PlayerPos;

typedef char *CanonBoard;

static long myNumPlayers,myNumPieces,myIndex,myGameSize,
myPlayerPosition[6],myMinDist;
static PlayerPos *myPositions;

/* global board */
static CanonBoard myBoard;

/* moveIncrement is added to a CanonPosition to find the adjacent square in the
* six possible directions 0..6, with 0==horizontal right, 1==down right, ...
* 5==up right
*/
static CanonPosition moveIncrement[6] =
{ { 0, 2}, { 1, 1}, { 1,-1}, { 0,-2}, {-1,-1}, {-1, 1} };

/* macros to access the board */
#define CanonRowSize(size) (6*(size)+1)
#define CanonBoardPos(row,col) (3*(myGameSize) +    \
(2*(myGameSize)+(row))*(CanonRowSize(myGameSize)) + (col))
#define CanonBoardVal(board,row,col)          \
board[CanonBoardPos(row,col)]
#define IsEmpty(board,row,col)             \
(kEmpty == board[CanonBoardPos(row,col)])

ConvertPositionToCanonPosition
/* Convert coordinates from problem statement to canonical coordinates */
static CanonPosition ConvertPositionToCanonPosition (
Position *pos, long size) {
CanonPosition canon;
canon.row = pos->row - 2 * size;
if (pos->row == 2 * (int)(pos->row/2)) {
canon.col = 2 * pos->col;
} else {
canon.col = 2 * pos->col - 1;
}
return canon;
}

ConvertCanonPositionToPosition
/* Convert canonical coordinates to coordinates from problem statement */
static Position ConvertCanonPositionToPosition (CanonPosition *canon, long size) {
Position pos;
pos.row = canon->row + 2 * size;
if (canon->row == 2 * (int)(canon->row/2)) {
pos.col = canon->col / 2;
} else {
pos.col = (canon->col + 1) / 2;
}
return pos;
}

RotateCanonPosition0ToN
/* rotate board by posNum increments of player positions (60 degrees) */
static CanonPosition RotateCanonPosition0ToN(
CanonPosition oldPos, long posNum) {
CanonPosition newPos;
while (posNum<0) posNum+=6;   /* normalize to 0..5 */
while (posNum>5) posNum-=6;
switch (posNum) {
case 0:
newPos.row = oldPos.row;
newPos.col = oldPos.col;
break;
case 1:
newPos.row = (oldPos.row + oldPos.col)/2;
newPos.col = (oldPos.col - 3*oldPos.row)/2;
break;
case 2:
newPos.row =  (oldPos.col - oldPos.row)/2;
newPos.col = -(oldPos.col + 3*oldPos.row)/2;
break;
case 3:
newPos.row = -oldPos.row;
newPos.col = -oldPos.col;
break;
case 4:
newPos.row = -(oldPos.row + oldPos.col)/2;
newPos.col = -(oldPos.col - 3*oldPos.row)/2;
break;
case 5:
newPos.row = -(oldPos.col - oldPos.row)/2;
newPos.col =  (oldPos.col + 3*oldPos.row)/2;
break;
}
return newPos;
}

MaxColInRow
/* return the max column number in a given row */
static long MaxColInRow(long row, long size) {
long maxCol;
if (row<-size) {
maxCol = row+2*size;
} else if (row<0) {
maxCol = 2*size-row;
} else if (row<=size) {
maxCol = row+2*size;
} else /* if (row<=2*size) */ {
maxCol = 2*size-row;
}
return maxCol;
}

IsLegalPosition
/* determine if a row,col coordinate represents a legal position */
static Boolean IsLegalPosition(CanonPosition *pos) {
long maxCol;
if ((pos->row<-2*myGameSize) || (pos->row>2*myGameSize))
return false;
if ((pos->row + pos->col) !=
2 * (int)((pos->row + pos->col)/2))
return false;
maxCol = MaxColInRow(pos->row,myGameSize);
if ((pos->col<-maxCol) || (pos->col>maxCol))
return false;
return true;
}

MoveFromTo
/* move a piece between positions from and to, does not check legality of move */
static void MoveFromTo(CanonBoard b,CanonPosition *from,CanonPosition *to,long newValue) {
PlayerPos *p = &myPositions[newValue*myNumPieces];
long oldValue = CanonBoardVal(b,from->row,from->col);
int i;

if (oldValue != newValue) {
DebugStr("\p check err");
}
if ( IsLegalPosition(from) && IsLegalPosition(to) ) {
CanonBoardVal(b,from->row,from->col) = kEmpty;
CanonBoardVal(b,to->row,to->col) = (char)newValue;
for (i=0; i<myNumPieces; i++) {
if (    (p[i].pos.row == from->row) &&
(p[i].pos.col == from->col)) {
p[i].pos.row = to->row;
p[i].pos.col = to->col;
break;
}
}
}
}

PositionDistFromGoal
/* return the distance of a given position from a goal postion for player 0 */
static long PositionDistFromGoal (const CanonPosition *a, const CanonPosition *goal) {
long rowDelta,colDelta;
rowDelta = a->row - goal->row;
if (rowDelta<0) rowDelta = -rowDelta;
colDelta = a->col - goal->col;
if (colDelta<0) colDelta = -colDelta;
if (rowDelta>=colDelta) return rowDelta;
else return rowDelta + (colDelta-rowDelta)/2;
}

PlayerDistFromGoal
/* return the cumulative distance of a player from his goal postion */
static long PlayerDistFromGoal(long player) {
long cumDist;
int i;
CanonPosition goal;
PlayerPos *p = &myPositions[player*myNumPieces];
goal.row = -2*myGameSize;
goal.col = 0;
goal =
RotateCanonPosition0ToN(goal,(myPlayerPosition[player]+3)%6);
for (i=0, cumDist=0; i<myNumPieces; i++) {
CanonPosition *cp = &p[i].pos;
long dist = PositionDistFromGoal(cp,&goal);
cumDist += dist;
}
return cumDist;
}

InitPlayer
/* initialize the positions for a player at a given position */
static void InitPlayer(char *b,PlayerPos *piecePositions, long player, long position,long size) {
CanonPosition pos,newPos;
int col,maxCol,pieceCount;
PlayerPos *piecePos;

pieceCount = 0;
for (maxCol=0; maxCol<size; maxCol++) {
pos.row = -2*size+maxCol;
maxCol = maxCol;
for (col=-maxCol; col<=maxCol; col+=2) {
pos.col = col;
newPos = RotateCanonPosition0ToN(pos,position);
CanonBoardVal(b,newPos.row,newPos.col) = (char)player;
piecePos = &piecePositions[myNumPieces*player + pieceCount];
piecePos->pos = newPos;
++pieceCount;
}
}
}

/* some variables to record the history of multi-jump moves, to
prevent them from repeating infinitely */
static CanonPosition gMoveHistoryPos[6*64];
static long gMoveHistoryDirection[6*64];
static long gMoveHistoryCtr = -1;

CalcMove
/* Calculate a move for a given piece for a given player in a given moveDir.
* Return true there is a legal move.
* Return doneWithThisDirection==true if there are no more moves in this direction.
*/
static Boolean CalcMove(
CanonBoard b, long player, long pieceNum, long moveDir,
CanonPosition *p1, CanonPosition *p2,
Boolean *doneWithThisDirection, long iterationLimit) {
Boolean legalMove = true;
if (gMoveHistoryCtr<0) {
PlayerPos *p = &myPositions[player*myNumPieces];
*p2 = *p1 = p[pieceNum].pos;
p2->row += moveIncrement[moveDir].row;
p2->col += moveIncrement[moveDir].col;
if (!IsLegalPosition(p2)) legalMove = false;
else if (IsEmpty(b,p2->row,p2->col)) {
} else {
long oldVal = CanonBoardVal(b,p2->row,p2->col);
p2->row += moveIncrement[moveDir].row;
p2->col += moveIncrement[moveDir].col;
if (!IsLegalPosition(p2)) legalMove = false;
else if (IsEmpty(b,p2->row,p2->col)) {
if (gMoveHistoryCtr>iterationLimit)
DebugStr("\p limit exceeded");
gMoveHistoryPos[++gMoveHistoryCtr] = *p1;
gMoveHistoryDirection[gMoveHistoryCtr] = 6;
gMoveHistoryPos[++gMoveHistoryCtr] = *p2;
gMoveHistoryDirection[gMoveHistoryCtr] = -1;
} else {
legalMove = false;
}
}
} else {
CanonPosition pStart,pTemp;
long newDir;
++gMoveHistoryDirection[gMoveHistoryCtr];
pStart = pTemp = gMoveHistoryPos[gMoveHistoryCtr];
while (   (gMoveHistoryCtr>=0) &&
(gMoveHistoryDirection[gMoveHistoryCtr]>=6) ) {
gMoveHistoryCtr-;
}
if (gMoveHistoryCtr>0) {
newDir = gMoveHistoryDirection[gMoveHistoryCtr];
pTemp.row += moveIncrement[newDir].row;
pTemp.col += moveIncrement[newDir].col;
if (!IsLegalPosition(&pTemp)) legalMove=false;
else if (IsEmpty(b,pTemp.row,pTemp.col)) legalMove=false;
else {
pTemp.row += moveIncrement[newDir].row;
pTemp.col += moveIncrement[newDir].col;
if (!IsLegalPosition(&pTemp)) legalMove=false;
else if (!IsEmpty(b,pTemp.row,pTemp.col)) legalMove=false;
else {
int i;
for (i=0; i<=gMoveHistoryCtr; i++)
if (   (pTemp.row == gMoveHistoryPos[i].row) &&
(pTemp.col == gMoveHistoryPos[i].col) )
legalMove=false;
if (legalMove) {
gMoveHistoryDirection[++gMoveHistoryCtr] = -1;
gMoveHistoryPos[gMoveHistoryCtr] = pTemp;
*p1 = gMoveHistoryPos[0];
*p2 = pTemp;
}
}
}
} else {
legalMove=false;
}

}
*doneWithThisDirection = (gMoveHistoryCtr<0);
return legalMove;
}

/* multiplier to determine how much storage to reserves for moves for each piece */
#define kMemAllocFudge 12

EnumerateMoves
static long EnumerateMoves(CanonBoard b, long player, CanonPosition moveFrom[], CanonPosition moveTo[]) {
long numMoves = 0;
int piece,moveDir;
Boolean legalMove,doneWithThisDirection;
for (piece=0; piece<myNumPieces; piece++) {
int pieceCounter=0;
int firstPieceMoveIndex = numMoves;
moveDir = 0;
do {
legalMove = CalcMove(b,player,piece,moveDir,
&moveFrom[numMoves],&moveTo[numMoves],
&doneWithThisDirection,6*myGameSize);
if (doneWithThisDirection)
++moveDir;
if (!legalMove) continue;
if (numMoves>=kMemAllocFudge*myNumPieces-1) {
DebugStr("\pnumMoves limit exceeded");
break;
} else {
int i;
for (i=firstPieceMoveIndex; i<numMoves; i++)
if ( (moveTo[i].row==moveTo[numMoves].row) &&
(moveTo[i].col==moveTo[numMoves].col) )
legalMove = false;
if (!legalMove) continue;
++numMoves;
}
} while (moveDir<6);
}
return numMoves;
}

MakeNextMove
/*
* Recursive routine to explore move tree.
* MakeNextMove iterates over all possible moves for a player.
* If ply limit is not yet reached, it recurses by calling for the next player.
* Ply limit is decreased by 1 when the "me" player is called.
* Recursion terminates when ply limit is reached.
* Score is assigned on return based on the perspective of the player making the move.
* Simple-minded score algorithm is used:
*   difference between player score and the best other player score, where
*   a player's score is the number of spaces he is away from the final state
* No alpha-beta pruning is employed - search is exhaustive.
*/

static long MakeNextMove(CanonBoard b, long me, long player, long playerDistances[6], long numPlys,
Boolean firstTime, CanonPosition *from, CanonPosition *to) {
long theMove,nextPlayer,numMoves,
bestScore=0x7FFFFFFF, myBestDistance=0x7FFFFFFF;
CanonPosition pFrom,pTo,bestFrom,bestTo;
int newPlys;
CanonPosition *moveFrom,*moveTo;

/* allocate storage for possible moves */
moveFrom = (CanonPosition *)
malloc(kMemAllocFudge*myNumPieces*sizeof(CanonPosition));
if (0==moveFrom)
DebugStr("\pproblem allocation moveFrom memory");
moveTo = (CanonPosition *)
malloc(kMemAllocFudge*myNumPieces*sizeof(CanonPosition));
if (0==moveTo)
DebugStr("\pproblem allocation moveTo memory");

/* prime best move with starting move */
bestFrom = *from;
bestTo = *to;
/* enumerate all legal moves for this player */
numMoves = EnumerateMoves(b,player,moveFrom,moveTo);
/* examine all of the enumerated moves */
for (theMove=0; theMove<numMoves; theMove++) {
long opponent,scoreDifference,minOpponentDistance,
myDistance,returnedDistances[6];
int thePlayer;
pFrom = moveFrom[theMove];
pTo = moveTo[theMove];
if (firstTime) {
*from = pFrom;
*to = pTo;
}
nextPlayer = (player+1)%myNumPlayers;
newPlys = (player==me) ? numPlys-1 : numPlys;

/* record move in the simulated board */
MoveFromTo(b,&pFrom,&pTo,player);

myDistance = PlayerDistFromGoal(player);

/* recurse if ply limit not reached */
if ( (newPlys>=0) && (myDistance>myMinDist) ){
/* MakeNextMove returns each player's distance from the goal in
returnedDistances, and the score from nextPlayer's perspective in
returnScore.
returnScore is ignored except by nonrecursive callers to MakeNextMove
*/
long returnScore;
returnScore =
MakeNextMove(b, me, nextPlayer, returnedDistances,
newPlys, false, from, to);
} else /*if (player==me)*/ {
/* terminating recursion, calculate position values for each player */
/* compute distances for all players */
for (thePlayer=0; thePlayer<myNumPlayers; thePlayer++)
returnedDistances[thePlayer] =
PlayerDistFromGoal(thePlayer);
}
/* compute best opponent score from this player perspective */
for (thePlayer=0,minOpponentDistance=0x7fffffff;
thePlayer<myNumPlayers; thePlayer++) {
if (   (thePlayer != player) &&
(returnedDistances[thePlayer]<minOpponentDistance) )
minOpponentDistance = returnedDistances[thePlayer];
}
scoreDifference =
returnedDistances[player]-minOpponentDistance;
/* Save score if it is the best for this player.
This move is best if
(1) our distance from goal minus best opponents distance is smallest, or
(2) goal distance difference is equal, but our absolute distance is smallest, or
(3) goal distance difference is equal, and coin flip says pick this move
(commented out) */
if ( (scoreDifference < bestScore) ||
((scoreDifference==bestScore) &&
(returnedDistances[player]<myBestDistance)) /*||
((scoreDifference==bestScore) && ((rand()&0x0080)==1))*/ ) {
bestScore = scoreDifference;
myBestDistance = returnedDistances[player];
for (opponent=0; opponent<myNumPlayers; opponent++)
playerDistances[opponent] = returnedDistances[opponent];
bestFrom = pFrom;
bestTo = pTo;
}
/* reverse move to clear board for mext move */
MoveFromTo(b,&pTo,&pFrom,player);
}
/* free dynamically allocated move storage */
free(moveTo);
free(moveFrom);

/* return best move */
*from = bestFrom;
*to = bestTo;

return bestScore;
}

FindBestMove
/* find best move for player me from this position on the board */
static long FindBestMove(CanonBoard b, long me, long numPlys, CanonPosition *from, CanonPosition *to) {
long playerDistances[6];

return MakeNextMove(b,me,me,playerDistances,numPlys,true,from,to);
}

InitChineseCheckers
void InitChineseCheckers(
long numPlayers,      /* 2..6  */
long gameSize, /* base of home triangle, 3..63, you have size*(size+1)/2 pieces */
long playerPosition[6],   /* 0..5, entries 0..numPlayers-1 are valid */
long yourIndex /* 0..numPlayers-1, your position is playerPosition[yourIndex] */
) {
int i,numPositions;
/* allocate memory for board */
numPositions = 6*(1+gameSize)*4*(1+gameSize);
myBoard = (char *)malloc(numPositions*sizeof(char));
if (myBoard==0) DebugStr("\p could not allocate board");
myNumPieces = gameSize*(gameSize+1)/2;
myPositions = (PlayerPos *)
malloc(6*myNumPieces*sizeof(PlayerPos));
if (myPositions==0)
DebugStr("\p could not allocate myPositions");

/* copy parameters */
for (i=0;i<6; i++) myPlayerPosition[i] = playerPosition[i];
myIndex = yourIndex;
myNumPlayers = numPlayers;
myGameSize = gameSize;
/* initialize board */
for (i=0; i<numPositions; i++) myBoard[i] = kEmpty;
for (i=0; i<numPlayers; i++) {
InitPlayer(myBoard,myPositions,i,playerPosition[i],gameSize);
}

/* calculate distance metric at goal position */
for (i=1, myMinDist=0; i<gameSize; i++) myMinDist += i*(i+1);
}

YourMove
void YourMove(
Position *fromPos,   /* originating position */
Position *toPos   /* destination position */
) {
CanonPosition from,to;
long numPlys = kMaxPlys;
FindBestMove(myBoard,myIndex,numPlys,&from,&to);
MoveFromTo(myBoard,&from,&to,myIndex);
*fromPos = ConvertCanonPositionToPosition(&from,myGameSize);
*toPos = ConvertCanonPositionToPosition(&to,myGameSize);
}

OpponentMove
void OpponentMove(
long opponent,   /* index in playerPosition[] of the player making move */
Position fromPos,   /* originating position */
Position toPos      /* destination position */
) {
CanonPosition from,to;
from = ConvertPositionToCanonPosition(&fromPos,myGameSize);
to =   ConvertPositionToCanonPosition(&toPos,myGameSize);
MoveFromTo(myBoard,&from,&to,opponent);
}

TermChineseCheckers
void TermChineseCheckers(void) {
free (myPositions);
free (myBoard);
}
```

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After a two week hiatus, we are back with another episode of The TouchArcade Show. Eli is fresh off his trip to Australia, which according to him is very similar to America but more upside down. Also kangaroos all over. Other topics this week... | Read more »
TouchArcade Game of the Week: ‘Dungeon T...
I’m a little conflicted on this week’s pick. Pretty much everyone knows the legend of Dungeon Raid, the match-3 RPG hybrid that took the world by storm way back in 2011. Everyone at the time was obsessed with it, but for whatever reason the... | Read more »
SwitchArcade Round-Up: Reviews Featuring...
Hello gentle readers, and welcome to the SwitchArcade Round-Up for July 19th, 2024. In today’s article, we finish up the week with the unusual appearance of a review. I’ve spent my time with Hot Lap Racing, and I’m ready to give my verdict. After... | Read more »
Draknek Interview: Alan Hazelden on Thin...
Ever since I played my first release from Draknek & Friends years ago, I knew I wanted to sit down with Alan Hazelden and chat about the team, puzzle games, and much more. | Read more »
The Latest ‘Marvel Snap’ OTA Update Buff...
I don’t know about all of you, my fellow Marvel Snap (Free) players, but these days when I see a balance update I find myself clenching my… teeth and bracing for the impact to my decks. They’ve been pretty spicy of late, after all. How will the... | Read more »
‘Honkai Star Rail’ Version 2.4 “Finest D...
HoYoverse just announced the Honkai Star Rail (Free) version 2.4 “Finest Duel Under the Pristine Blue" update alongside a surprising collaboration. Honkai Star Rail 2.4 follows the 2.3 “Farewell, Penacony" update. Read about that here. | Read more »
‘Vampire Survivors+’ on Apple Arcade Wil...
Earlier this month, Apple revealed that poncle’s excellent Vampire Survivors+ () would be heading to Apple Arcade as a new App Store Great. I reached out to poncle to check in on the DLC for Vampire Survivors+ because only the first two DLCs were... | Read more »
Homerun Clash 2: Legends Derby opens for...
Since launching in 2018, Homerun Clash has performed admirably for HAEGIN, racking up 12 million players all eager to prove they could be the next baseball champions. Well, the title will soon be up for grabs again, as Homerun Clash 2: Legends... | Read more »
‘Neverness to Everness’ Is a Free To Pla...
Perfect World Games and Hotta Studio (Tower of Fantasy) announced a new free to play open world RPG in the form of Neverness to Everness a few days ago (via Gematsu). Neverness to Everness has an urban setting, and the two reveal trailers for it... | Read more »
Meditative Puzzler ‘Ouros’ Coming to iOS...
Ouros is a mediative puzzle game from developer Michael Kamm that launched on PC just a couple of months back, and today it has been revealed that the title is now heading to iOS and Android devices next month. Which is good news I say because this... | Read more »

## Price Scanner via MacPrices.net

Amazon is still selling 16-inch MacBook Pros...
Prime Day in July is over, but Amazon is still selling 16-inch Apple MacBook Pros for \$500-\$600 off MSRP. Shipping is free. These are the lowest prices available this weekend for new 16″ Apple... Read more
Walmart continues to sell clearance 13-inch M...
Walmart continues to offer clearance, but new, Apple 13″ M1 MacBook Airs (8GB RAM, 256GB SSD) online for \$699, \$300 off original MSRP, in Space Gray, Silver, and Gold colors. These are new MacBooks... Read more
Apple is offering steep discounts, up to \$600...
Apple has standard-configuration 16″ M3 Max MacBook Pros available, Certified Refurbished, starting at \$2969 and ranging up to \$600 off MSRP. Each model features a new outer case, shipping is free,... Read more
Save up to \$480 with these 14-inch M3 Pro/M3...
Apple has 14″ M3 Pro and M3 Max MacBook Pros in stock today and available, Certified Refurbished, starting at \$1699 and ranging up to \$480 off MSRP. Each model features a new outer case, shipping is... Read more
Amazon has clearance 9th-generation WiFi iPad...
Amazon has Apple’s 9th generation 10.2″ WiFi iPads on sale for \$80-\$100 off MSRP, starting only \$249. Their prices are the lowest available for new iPads anywhere: – 10″ 64GB WiFi iPad (Space Gray or... Read more
Apple is offering a \$50 discount on 2nd-gener...
Apple has Certified Refurbished White and Midnight HomePods available for \$249, Certified Refurbished. That’s \$50 off MSRP and the lowest price currently available for a full-size Apple HomePod today... Read more
The latest MacBook Pro sale at Amazon: 16-inc...
Amazon is offering instant discounts on 16″ M3 Pro and 16″ M3 Max MacBook Pros ranging up to \$400 off MSRP as part of their early July 4th sale. Shipping is free. These are the lowest prices... Read more
14-inch M3 Pro MacBook Pros with 36GB of RAM...
B&H Photo has 14″ M3 Pro MacBook Pros with 36GB of RAM and 512GB or 1TB SSDs in stock today and on sale for \$200 off Apple’s MSRP, each including free 1-2 day shipping: – 14″ M3 Pro MacBook Pro (... Read more
14-inch M3 MacBook Pros with 16GB of RAM on s...
B&H Photo has 14″ M3 MacBook Pros with 16GB of RAM and 512GB or 1TB SSDs in stock today and on sale for \$150-\$200 off Apple’s MSRP, each including free 1-2 day shipping: – 14″ M3 MacBook Pro (... Read more
Amazon is offering \$170-\$200 discounts on new...
Amazon is offering a \$170-\$200 discount on every configuration and color of Apple’s M3-powered 15″ MacBook Airs. Prices start at \$1129 for models with 8GB of RAM and 256GB of storage: – 15″ M3... Read more

## Jobs Board

*Apple* Systems Engineer - Chenega Corporati...
…LLC,** a **Chenega Professional Services** ' company, is looking for a ** Apple Systems Engineer** to support the Information Technology Operations and Maintenance Read more
Solutions Engineer - *Apple* - SHI (United...
**Job Summary** An Apple Solution Engineer's primary role is tosupport SHI customers in their efforts to select, deploy, and manage Apple operating systems and Read more
*Apple* / Mac Administrator - JAMF Pro - Ame...
Amentum is seeking an ** Apple / Mac Administrator - JAMF Pro** to provide support with the Apple Ecosystem to include hardware and software to join our team and Read more
Operations Associate - *Apple* Blossom Mall...
Operations Associate - Apple Blossom Mall Location:Winchester, VA, United States (https://jobs.jcp.com/jobs/location/191170/winchester-va-united-states) - Apple Read more
Cashier - *Apple* Blossom Mall - JCPenney (...
Cashier - Apple Blossom Mall Location:Winchester, VA, United States (https://jobs.jcp.com/jobs/location/191170/winchester-va-united-states) - Apple Blossom Mall Read more
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