Author: Heiner Marxen
Date: 16:35:00 05/23/01
Go up one level in this thread
On May 23, 2001 at 15:37:07, leonid wrote: > >>Hey, Leonid, what about some problems with lots of pawns? >>That sort of piece is missing in your creations, up to now, right? > >Hi, Heiner! > >I don't use that much pawns since they signify little mobily. This last position >came just from three close positions that had pawns. If I presented before >without pawns it is because it was the simplest one. Very few people here are >ready for some deep thinking before week-end. Now you can see the other two, >even if initially I expected to write only deepest mate. Anyway, both positions >are very easy and accessible for every possible program. They have limited >number of moves to start. Everybody can try and solve them. > >[D]RqqkqqR1/rPNbNPr1/QnqBqnQ1/bqRQRqb1/Q2K2Q1/3B4/8/8 w - - This one is quite easy even for Chest's brute force attack: K7/600, 47.74 sec. Six key moves lead to mate in 9: Nxc6+ Qxc6 fxe8Q+ Nxe8 bxc8Q+ Qxc8 Nxe6+ Qxe6 Q4xg5+ Qee7 Bxe7+ Qxe7 Rxe8+ Kc7 Rxc6+ Bxc6 Qgxc6# Nxe6+ Qxe6 fxe8Q+ Nxe8 Nxc6+ Qbxc6 Q4xg5+ Re7 Bxe7+ Qfxe7 bxc8Q+ Nxc8 Qxe8+ Kc7 Qd8+ Qxd8 Qxd8# bxc8Q+ Nxc8 fxe8Q+ Qxe8 Nxc6+ Qxc6 Nxe6+ Qxe6 Q4xa5+ Qbc7 Be7+ Kxe7 Rxe6+ Bxe6 Qgxe6+ Qxe6 Qaxe6# bxc8R+ Nxc8 fxe8Q+ Qxe8 Nxc6+ Qxc6 Nxe6+ Qxe6 Q4xa5+ Qbc7 Be7+ Kxe7 Rxe6+ Bxe6 Qgxe6+ Qxe6 Qaxe6# fxe8Q+ Nxe8 bxc8Q+ Qxc8 Nxc6+ Qxc6 Nxe6+ Qxe6 Q4xg5+ Qee7 Bxe7+ Qxe7 Rxe8+ Kc7 Rxc6+ Bxc6 Qgxc6# fxe8R+ Nxe8 bxc8Q+ Qxc8 Nxc6+ Qxc6 Nxe6+ Qxe6 Q4xg5+ Qee7 Bxe7+ Qxe7 Rxe8+ Kc7 Rxc6+ Bxc6 Qgxc6# >[D]RrqkqrR1/qPNbNPq1/BnqBqnB1/bqQQQqb1/Q2K2Q1/3B4/8/8 w - - This one has an even smaller effective branching factor. It has the same set of solution moves, but it is a mate in 12: Nxc6+ Qxc6 bxc8Q+ Rxc8 Nxe6+ Qfxe6 fxe8Q+ Rxe8 Rxe8+ Nxe8 Qxg5+ Nf6 Rxc8+ Nxc8 Qxa5+ Nb6 Qexe6 Qa4+ Qxa4 Bc6 Be7+ Kc7 Qge5# Nxe6+ Qxe6 fxe8Q+ Rxe8 Nxc6+ Qbxc6 bxc8Q+ Rxc8 Rxe8+ Nxe8 Qxg5+ Nf6 Rxc8+ Nxc8 Qxa5+ Nb6 Qexe6 Qa4+ Qxa4 Bc6 Be7+ Kc7 Qge5# bxc8Q+ Rxc8 fxe8Q+ Rxe8 Nxc6+ Qxc6 Nxe6+ Qxe6 Rxe8+ Nxe8 Qxg5+ Nf6 Rxc8+ Nxc8 Qxa5+ Nb6 Qexe6 Qa4+ Qxa4 Bc6 Be7+ Kc7 Qge5# bxc8R+ Rxc8 fxe8Q+ Rxe8 Nxc6+ Qxc6 Nxe6+ Qxe6 Rxe8+ Nxe8 Qxg5+ Nf6 Rxc8+ Nxc8 Qxa5+ Nb6 Qexe6 Qa4+ Qxa4 Bc6 Be7+ Kc7 Qge5# fxe8Q+ Rxe8 bxc8Q+ Rxc8 Nxc6+ Qxc6 Nxe6+ Qxe6 Rxe8+ Nxe8 Qxg5+ Nf6 Rxc8+ Nxc8 Qxa5+ Nb6 Qexe6 Qa4+ Qxa4 Bc6 Be7+ Kc7 Qge5# fxe8R+ Rxe8 bxc8Q+ Rxc8 Nxc6+ Qxc6 Nxe6+ Qxe6 Rxe8+ Nxe8 Qxg5+ Nf6 Rxc8+ Nxc8 Qxa5+ Nb6 Qexe6 Qa4+ Qxa4 Bc6 Be7+ Kc7 Qge5# Although only 40MB hash have been used, it helped a lot (factor 13). K7/600, 163.78 sec. Cheers, Heiner
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