Author: Andrew Platt
Date: 17:52:33 09/22/04
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On September 22, 2004 at 08:34:04, Stan Arts wrote: >On September 22, 2004 at 07:53:37, Andrew Platt wrote: > >>Actually, more accurately a problem with null move and a position that appeared >>in this week's Washington Post Chess column: >> >>[D] 3K4/8/2ppp3/2pkp3/2ppp3/8/4P3/3Q4 w - - 0 1 >> >>The main thing to do is to wait for black to commit suicide, something that null >>moves are very bad at doing! The solution is to make an active waiting move that >>will position the Queen directly later: >> >>1. Qa1 d3 2. Qc3 e3 3. exd3 cxd3 4.Qxd3# >> >>However, Schola does not want to get this mate. I can run it as long as I like >>and it still goes for the longer mate: >> >>1. Kd7 d3 2. e3 c3 3. Qb3+ c4 4. Qb4 c2 5. Qxd6# >Maybe the first problem is doing nullmoves for black, even when he has no >pieces? That seems very risky, just think of pawn-endgames where the kings Thanks for this: This was the problem. Fixing this (I needed to add the current piece count to the position and update it on make / unmake move) made Schola find Qa1 in 1 millisecond and solve the mate in 3! I thought that with verified null move I wouldn't need this check so perhaps I still need to look further? Andy.
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