Author: Dana Turnmire
Date: 08:48:15 12/13/02
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On December 13, 2002 at 11:14:44, Dana Turnmire wrote: >It keeps coming up that positional tests aren't accurate because programs may >find the correct solution for the wrong reasons. Chessmaster 9000 has a unique >feature (as far as I know) that explains *why* it recommends the moves it does. >Would that solve the problem of knowing if it found the right answer for the >wrong reasons? If so would it be possible to add such a feature to the other >programs? Here is what Chessmaster says about position 1 in the GCP test suite. Notice it gives in the last paragraph the reason it chooses the move. This is one position that Uri Blass says can be solved for the wrong reasons. "The Chessmaster recommends: Bishop to g4. Analysis: You move your bishop to g4, which attacks White's queen and blocks White's pawn at g3. White counters with the queen to f2, which moves it to safety. You move your pawn to d4, which protects your bishop at c5 and attacks White's bishop at e3. White responds with bishop at e3 takes pawn, which attacks your bishop at c5 and isolates your pawn at c7 and your pawn at c6. Your bishop takes bishop, which pins White's pawn at b2 and forks White's queen and White's pawn at b2. White counters with queen takes bishop, which releases White's pawn at b2 from the pin and protects White's pawn at b2. You move your queen to g2, which forks White's king and White's rook at h1. White responds by moving king to c3, which moves it out of check. Your queen captures rook, which pins White's knight. White replies by moving pawn to b3. You move your king to h8. White responds by moving the king to b2, which frees White's knight from the pin. You move your queen to d5, which threatens White's queen. White responds by moving queen to c3, which moves it to safety. You move your knight to e4, which attacks White's queen. White answers with bishop takes knight, which removes the threat on White's queen and attacks your queen. Your rook takes bishop, which protects your queen." "As a result of this sequence of moves, you win a rook and two bishops for a bishop, a knight, and a pawn. Additionally, the mobility of White's pieces is greatly decreased. Also, the development of White's pawns is a little weaker."
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