Author: Daniel Mehrmannn
Date: 07:42:00 06/16/05
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On June 15, 2005 at 16:36:54, Eric Oldre wrote: > >I was wondering if anyone would like to volunteer any tricks they've >used to help find certain bugs in their search function. > >I think that the ideas of using perft for move generation and >reversing the board to find bugs in the evaluation have both >been really useful to me. I was wondering if anyone has used >techniques similar to these to help find search bugs. > >I understand that just because a engine can properly pass these >and other tests doesn't mean it's free of bugs. But they certainly >help detect at least some of them. > >I'm certain that there must be plenty of bugs in Latista's search >and I think it's time for me to work on discovering them. If >you don't have any automated tricks like above. Does anyone >have any general advise to help me spot some bugs? > >Eric Oldre > >PS. I have at various spots in my program tried to follow a similar >model of asserts as in fruit. I'm sure taking some time to >do this at more parts of my program would help. I suggest that you use such function too and call them with a va_list: BOOL CheckBoard(void) { uint32 i, wKing, bKing; gameData_t *mgdPtr = &gameData; char buffer[STD_BUFF]; for (i = 0; i < 64; i++) { switch (mgdPtr->piece[i]) { case W_PAWN: case B_PAWN: case W_KNIGHT: case B_KNIGHT: case W_BISHOP: case B_BISHOP: case W_ROOK: case B_ROOK: case W_QUEEN: case B_QUEEN: continue; case W_KING: wKing++; continue; case B_KING: bKing++; continue; case EMPTY: continue; default: sprintf(buffer, "Unkown Piece %d on Square %d. node = %lu\n", mgdPtr->piece[i], i, mgdPtr->nodes); LogIntern(buffer); printf("%s", buffer); showCurrentLine(); return FALSE; } } if (!wKing) { sprintf(buffer, "no white King found !\n"); LogIntern(buffer); printf("%s", buffer); return FALSE; } if (!bKing) { sprintf(buffer, "no black King found !\n"); LogIntern(buffer); printf("%s", buffer); return FALSE; } return TRUE; } daniel
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