No. 25, Spring 2007
651 - Dmitri Baibikov Mat Plus 25, Spring 2007
11+13. Add men, then mate in 1 move
[RBRqBb2/nQr2pp1/2pK1p2/1k6/bPpp2p1/1P1P2P1/3P4/8]
652 - Günther Weeth, Klaus Wenda Mat Plus 25, Spring 2007
10+9. Retract 2 moves, then mate in 1 move (Proca retractor, Anticirce)
[4B3/8/R7/2p5/npKN4/k1P3p1/PpPBr1P1/2N2bq1]
653 - Klaus Wenda Mat Plus 25, Spring 2007
4+12. Retract 8 moves, then mate in 1 move (Proca retractor without forward defense, Anticirce)
[1bR5/p7/8/5p1r/n1BRp3/k1qp1p2/2br4/4K3]
654 - Michael Grushko Mat Plus 25, Spring 2007
2+3. Retract 2 moves, then self mate in 1 move (Proca retractor, Messigny, Köko)
[8/4p3/P3K3/2k5/8/8/8/6b1]
655 - Bernd Schwarzkopf Mat Plus 25, Spring 2007
1+1. Add for an illegal cluster:
a) 6 white hamsters b) 7 white hamsters c) 8 white hamsters
[5K1k/8/8/8/8/8/8/8]
656 - Marco Bonavoglia Mat Plus 25, Spring 2007
10+14. Shortest proof game in 10.0 moves
[rnbqkbnr/1ppp1ppp/8/3P4/8/8/PPPNP1PP/4K2R]
657 - Michel Caillaud Mat Plus 25, Spring 2007
14+15. Shortest proof game in 18.5 moves
[2b2k2/ppp1pp1p/4p2n/2r5/1rn1P3/4b3/PPqP1PPP/RNB1KBNR]
658 - Andrei Frolkin, Kostas Prentos Mat Plus 25, Spring 2007
13+12. Shortest proof game in 18.5 moves, then helpmate in 1 move
[rn1qk2r/p1B1nb1p/3p4/7Q/1bRKPPB1/2P2N1R/1PP3pP/8]
659 - René J. Millour Mat Plus 25, Spring 2007
What is in Monochrome Alice Chess the total number of legal positions having at most 3 pieces?