Author: Inmann Werner
Date: 13:45:01 10/31/98
I have problems with "nearly mate" positions, where the opponent can do some checks, so the mate gets beyond the horizon. One Example (really interesting!) Position (LCTII CMB 01) xrxxxxkx xqxxbpxx xxxpxxpx xxpPxxxx PxNxxxxR xxPxxQPx xPxxxPKx xxxxxxxx Best: c4d6/e7d6/f3f6 white wins In depth 7 , my program should find the solution, but it does not! The problem is, that black can make checks to bring the mate beyond the horizon. At each check, I extend the search for 1 ply, but it is not enough. The computer thinks: C4d6/e7d6/f3f6/b7d5+/g2h2/d6g3+!!/h2g3/d5d3+/g3h2/g8f8/ no h4h8 and black "stands good" 7 plys plus 3 plys the checks end up at 10!! This things really often happen, and I am reall unhappy with it. When I tried to extend at a check with 2 plys, this problem was solved very early. But the overall searchdepth goes dramatically down, so the program plays worse. On an attack, it is nearly always possible for the opponent to slow down the attack with "senseless", but forced moves. I thought about something like: This is a mate in 1, therefore don´t let you disturb with "senseless " moves. But I have no thought, how to implement such a thing. Suggestions? Werner
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