Author: Steven Edwards
Date: 03:32:22 10/18/03
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On October 17, 2003 at 17:45:08, William Kerr wrote: >I posted the worlds toughest mate in 4 yesterday but I included the wrong epd >string. That was a tough mate in 4 but this one is far far tougher for some >engines. Its probably a null move issue for some engines. > >[D] 5R2/2K5/1pP5/4k2p/3pp3/2p4N/B4N1b/n1R1B2b w - - id BB #1217 mate in 4; My toolkit solves this in 1.78 seconds on an 800 MHz PPC: Key: Rxc3 PV: (1. Rxc3 Nc2 2. Rg3 Bxg3 3. Ng4+ hxg4 4. Bxg3#)
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