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Mat Plus

No. 25, Spring 2007

651 - Dmitri Baibikov
Mat Plus 25, Spring 2007

[RBRqBb2/nQr2pp1/2pK1p2/1k6/bPpp2p1/1P1P2P1/3P4/8]

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

[4B3/8/R7/2p5/npKN4/k1P3p1/PpPBr1P1/2N2bq1]

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

[1bR5/p7/8/5p1r/n1BRp3/k1qp1p2/2br4/4K3]

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

[8/4p3/P3K3/2k5/8/8/8/6b1]

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

[5K1k/8/8/8/8/8/8/8]

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

[rnbqkbnr/1ppp1ppp/8/3P4/8/8/PPPNP1PP/4K2R]

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

[2b2k2/ppp1pp1p/4p2n/2r5/1rn1P3/4b3/PPqP1PPP/RNB1KBNR]

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

[rn1qk2r/p1B1nb1p/3p4/7Q/1bRKPPB1/2P2N1R/1PP3pP/8]

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?