No. 204, Dec 2003
12111 - Andrei Kornilov, Andrei Frolkin Die Schwalbe, 204, Dec 2003
13+12. Add a white piece on the h-line. a) Last move? b) Last move by the black king?
[3b1KQ1/p1pprp2/4pR1k/5pRq/6PB/4P1pb/2PP1PP1/3N1N2]
12112 - Josef Haas(+), Günther Weeth, Werner Keym Die Schwalbe, 204, Dec 2003
11+9. Retract 3 half-moves (white starts the retraction). Can white prevent black castling? (Proca retractor)
[r3k3/pppp2p1/8/4K3/3p4/5P1P/1PPPP1P1/2B2BnR]
12113 - Dmitri Baibikov Die Schwalbe, 204, Dec 2003
12+9. Which bishops are promoted?
[BBBB4/Rpp1k1pp/BRppp3/Bp6/B7/B7/K7/B7]
12114 - Jens Guballa Die Schwalbe, 204, Dec 2003
14+15. Shortest proof game 14.5 moves
[rnb1k3/ppppp2p/5ppb/5nR1/3N3Q/6Pq/PPPPP1B1/RNB2K2]
12115 - Christoph Fieberg Die Schwalbe, 204, Dec 2003
11+12. Shortest proof game in 19.0 moves
[1nB1k1n1/Ppp2p2/4p3/8/4p3/1p6/1P1P1PPR/1bKNrqNR]
12116 - Reto Aschwanden Die Schwalbe, 204, Dec 2003
14+14. Shortest proof game in 19.5 moves
[3rbn2/1p1q1k2/2p2r1n/2p2p1p/8/p3b1K1/PPPPP1P1/RNBQ1BNR]
12117 - Wolfgang Dittmann Die Schwalbe, 204, Dec 2003
6+11. Retract 5 half-moves for a mate in one move (Proca retractor, Anticirce)
[2kr2b1/p6p/p6P/p6N/p6N/r6P/7P/2nnK3]
12118 - Henryk Grudzinsky Die Schwalbe, 204, Dec 2003
4+3. Anti-Andernach-Chess. Shortest proof game in 14.5 moves
[8/3pk2p/8/8/8/8/3PK2P/1R6]
Anti-Andernach-Chess: A piece changes colur when moving, and keeps its color when capturing
12119 - Ion Mururasu, Vlaicu Crisan Die Schwalbe, 204, Dec 2003
16+14. a) Shortest proof game in 5.5 moves (2 solutions) b) +bPf7 (Einstein Chess)
[1nbqkbnr/1pppp1pp/8/p7/5K2/8/PPPPPPPP/RNBQ1BNR]
12120 - Hauke Reddmann Die Schwalbe, 204, Dec 2003
8+0. Shortest series-proof-game with an 8-fold cyclical permutation of the pieces? (i.e. Piece 1 is on the begin square of piece 2, ...., piece 8 is on the begin square of piece 1)
[8/8/8/8/8/8/8/RNBQKBNR]