The Retrograde Analysis Corner

StrateGems

No. 8, Oct-Dec 1999

R0033 - Pal Benko

StrateGems 8, Oct-Dec 1999

[8/5N2/2kP1r2/7b/P7/6KB/7r/2R3BQ]

8+4. Is the position legal?

[8/5N2/2kP1r2/7b/P7/6KB/7r/2R3BQ]

R0034 - Pal Benko

StrateGems 8, Oct-Dec 1999

[5Q2/8/8/K7/8/8/4p3/4k3]

2+2. Retract one move, and h#1 (3 solutions)

[5Q2/8/8/K7/8/8/4p3/4k3]

R0035 - Leonid N. Borodatov

StrateGems 8, Oct-Dec 1999

Dedicated to Thomas Volet's 50th birthday

[8/3pp1p1/3p2p1/3P4/P1P5/1B1P1p2/2Pr2P1/k1K5]

8+8. Who wins? a) diagram b) Add wPe2

[8/3pp1p1/3p2p1/3P4/P1P5/1B1P1p2/2Pr2P1/k1K5]

R0036 - Klaus Wenda

StrateGems 8, Oct-Dec 1999

[8/3G4/k1G5/PNK5/2QN4/8/8/8]

7+1. Retract 4 white moves, and s#2 (Grasshopper c6, d7)

[8/3G4/k1G5/PNK5/2QN4/8/8/8]

P0045 - Satoshi Hashimoto

StrateGems 8, Oct-Dec 1999

[rnb2bnr/ppp2pkp/5pp1/8/8/8/PPP1PPPP/RNBQKBNR]

15+14. Proof game in 9.0 moves

[rnb2bnr/ppp2pkp/5pp1/8/8/8/PPP1PPPP/RNBQKBNR]

P0046 - Satoshi Hashimoto

StrateGems 8, Oct-Dec 1999

[2kr1bnr/p1p2ppp/1qn5/2ppp3/8/5P2/PPPP1PPP/RNBQK1NR]

15+15. Proof game in 10.5 moves

[2kr1bnr/p1p2ppp/1qn5/2ppp3/8/5P2/PPPP1PPP/RNBQK1NR]

P0047 - Satoshi Hashimoto

StrateGems 8, Oct-Dec 1999

[r1b1k1nr/1ppp1ppp/1b6/4p2P/6n1/pP3P2/PP1PP1P1/RNBQK2R]

14+15. Proof game in 15.5 moves

[r1b1k1nr/1ppp1ppp/1b6/4p2P/6n1/pP3P2/PP1PP1P1/RNBQK2R]

P0048 - Michel Caillaud

StrateGems 8, Oct-Dec 1999

[1nbqkbnr/pQpNpppp/1pp5/8/3P3R/1P2PPK1/1PPN2PP/2B4R]

15+15. Proof game in 16.0 moves

[1nbqkbnr/pQpNpppp/1pp5/8/3P3R/1P2PPK1/1PPN2PP/2B4R]

P0049 - Noam Livnat

StrateGems 8, Oct-Dec 1999

(This problem was later found to be cooked)

[Q5n1/N3kpp1/Bb2p3/RpppR2p/P2rPPPr/3P2Bb/1PPK3n/1N5q]

15+15. Proof game in 23.0 moves

[Q5n1/N3kpp1/Bb2p3/RpppR2p/P2rPPPr/3P2Bb/1PPK3n/1N5q]