February 2004

R225 -

10+13. Release the position

[3BKnqr/p1Ppp1pn/P1p1p1Pb/k5p1/8/4P3/4P1PP/5B2]

Solution

R226 -

13+16. a) Shortest proof game in 7.5 moves (C+) b) Proof game in exactly 12.0 moves

[1rbqkb1r/ppppp1pp/n4p2/8/2BQn3/8/PPPNN1PP/R1B1K2R]

Solution

R227 -

13+15. Shortest proof game in 18.0 moves (C+)

[4qbb1/3kp2n/1pp2p1n/2pp3r/7p/3P3r/PPP1PP2/RNB1KBNR]

Solution

R228 -

16+16. Shortest proof game in 21.5 moves

[K3Q3/3n2rr/pppppppp/q2Nk3/1bb3n1/1PP5/P2PPPPP/B2R1BNR]

Solution

R229 -

14+10. Shortest proof game in 21.5 moves

[r1bk1bRr/pp1pp2Q/2p3B1/4B3/P4P1R/2PP1P2/7P/3N2NK]

Solution

R230 -

15+15. Shortest proof game in 21.5 moves

[rnbR1nk1/1Qpp1ppp/p1p1p3/8/7b/P5P1/P1PPPP1P/RNBqN1K1]

Solution

R231 -

15+16. Shortest proof game in 5.0 moves (Circe)

[rnbqkbnr/pppppp1p/7p/8/3P4/5P2/PPP2PPP/RN1QKBNR]

Solution

R232 -

5+5. Retract 13 half-moves for a mate in one (Anticirce, Proca-retractor without forward defense)

In a normal Proca retractor, black can defend by taking back a move which results in a position in which black can reach the aim. This forward defense isn't allowed in R232.

[8/5P2/8/1n3P2/8/k6b/3p2P1/b1N2K2]

Solution

R233 -