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Peter Karrer, (October 7, 1955 - November 20, 2010)
was a Swiss computer scientist affiliated with ETH Zurich ^[1] and chess player ^[2] last playing in the German Chess Landesliga at chess club Engen ^{[3] [4]}. After the Kasparov versus the World game in 1999, Peter Karrer constructed a specialized tablebase for the purpose of fully understanding the KQQKQP and KQPKQP endgames. With the aid of the tablebase, Irina Krush and Ken Regan were able to prove that the position after the World Team's 50th move was drawn with best play on both sides ^{[5] [6]}. Both Kasparov and the bulletin board suspected that the position was drawn, but as the further course of the game proved, no one fully understood the position at the time.

Maximals

Karrer has mined Endgame Tablebases to produce complete lists of ^[7] :

• maxDTM positions and data: 1-0 and 0-1, wtm and btm,
• maxDTM and all mutual zugzwangs: three types, positions and data.

Data on percentage results, maximals and mutual zugzwangs has been filed and made available on the web, as have the DTM EGTs ^[8]. Most notably was his finding of a mate in 262 in KRNKNN ^[9].

Selected Publications

^[10]

• Peter Karrer (2000). KQQKQP and KQPKQP≈. ICGA Journal, Vol. 23, No. 2 ^[11]
• Guy Haworth, Peter Karrer, John Tamplin, Christoph Wirth (2001). 3-5-man chess: Maximals and mzugs. ICGA Journal, Vol. 24, No. 4

References

1. ^ Peter Karrer Announces SLIP for WFW
2. ^ 7. Winterthurer Schachwoche 2007
3. ^ BSV Ergebnisdienst - Landesliga Region Schwarzwald/Bodensee 2009/2010 - SK Engen
4. ^ BSV Ergebnisdienst - Landesliga Region Schwarzwald/Bodensee 2010/2011 - SK Engen
5. ^ Kasparov Versus the World: The Great Internet Match
6. ^ Irina Krush, Ken Regan (1999). The Greatest Game in the History of Chess. A Special Report by Irina Krush, Official MSN Game Analyst, part 2, part 3 with Paul Hodges
7. ^ Guy Haworth, Peter Karrer, John Tamplin, Christoph Wirth (2001). 3-5-man chess: Maximals and mzugs. ICGA Journal, Vol. 24, No. 4
8. ^ Chess Archives - Endgames (DTC, DTM, DTZ, DTZ-50) hosted by John Tamplin
9. ^ OPEN CHESS DIARY 60. April 8, 2000: Play chess with God by Tim Krabbé
10. ^ ICGA Reference Database (pdf)
11. ^ Kasparov versus the World from Wikipedia

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