MESON Chess Problem Database

Problem Display
PID: 142155 (K4R2/4n2p/2Q2Pkp/p4r1p/r2p1p1P/7N/4P1b1/BBb1n1Rq w - - 0 1)

Cheylan, Yves

Die Schwalbe, 1974

K4R2/4n2p/2Q2Pkp/p4r1p/r2p1p1P/7N/4P1b1/BBb1n1Rq

#2

10 + 14

SOLUTION

  • SOUND
  • Sets
    • 1...Bb2
      • 2.Sxf4#
    • 1...Ba3
      • 2.Sxf4#
    • 1...Sf3
      • 2.Qe8#
    • 1...Sd5
      • 2.Qe8#
    • 1...f3
      • 2.Qe8#
  • Tries
    • 1.Rxg2+?
      • 1...Sxg2
        • 2.Qe8#
      • 1...Qxg2!
  • Keys
    • 1.e4!
      • threat
        • 2.Qe8#
      • 1...Rxf6
        • 2.Qxf6#
      • 1...Sxc6
        • 2.exf5#
      • 1...dxe4 ep
        • 2.fxe7#
      • 1...fxe4 ep
        • 2.Sf4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 5
  • Sets
    • B(a);N_GUARD::S(E),XP(g)
    • S(b);N_PINQ(G)::QAB(G)
    • S(m);N_PINQ(G)::QAB(G)
    • P(g);N_PINQ(G)::QAB(G)
  • Tries
    • Try
      • R(C);CHECK,N_SPINQ(G),XB(d)
      • Vars
        • S(b);XR(C)::QAB(G)
      • Refutation
        • Q(c);P_PINQ(G),XR(C)
  • Actual
    • P(D);N_PINR(i),N_SPINQ(G)
    • Threat
      • QAB(G)
    • Vars
      • R(i);OGATE,P_SPINR(i),XP(H)::QAR1(G),XR(i)
      • S(m);N_GUARD,XQ(G)::P(D),XR(i)
      • P(f);EP,P_PINQ(G),P_SPINR(i),XP(D)::QAR(G)+P(H),XS(m)
      • P(g);EP,P_PINQ(G),P_SPINR(i),S_CUTB(a),XP(D)::S(E)
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Developed and maintained by Brian Stephenson.
Implemented with HTML5, MySQL, Perl (with, inter alia, CGI::Simple, HTML::Template & XML::LibXML) & CSS/Javascript (jQuery, Bootstrap & DataTables).