Computer Chess Club Archives




Subject: Re: Two mate positions to solve.

Author: Hans Havermann

Date: 14:27:58 09/03/00

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Combination: human facilitator; (400 MHz iMac) Sigma Chess, MacChess...

On September 02, 2000 at 17:08:20, leonid wrote:

> 1r2k2r/1b3pbp/1NPqN1n1/1P1Q4/1P2P3/P3B3/5PP1/R3KB1R White to go.

It took Sigma Chess 5.0's mate solver 7 minutes, 31 seconds to determine there
is no M5. Knowing that, the M6 found by MacChess 5.0.1 in 3 seconds suffices: 1.
Qxd6 Bc3+ 2. Ke2 fxe6 3. Qd7+ Kf8 4. Bh6+ Bg7 5. Qxg7+ Ke8 6. Qd7++. Total
machine time: 7 minutes, 34 seconds.

> 6KQ/3B2Q1/QQQQQQQ1/5Nbn/qqqqq1q1/5qqk/8/8 White to go.

MacChess finds a M8 in 11 minutes, 32 seconds: 1.	Qgxh5+ Qxh5 2.	Qxg3+ Qxg3
3.	Nxd4+ Qexe6+ 4.	Bxe6+ Qxe6+ 5.	Qfxe6+ Kh2 6.	Qxh5+ Qh3 7.	Qhxh3+ Kg1
8.	Qaf1++. I'm running the M7 mate solve in Sigma Chess but my guess is that it
will take days. :(

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