MESON Chess Problem Database

Problem Display
PID: 143264 (8/2nrP1r1/2p5/R2nk1qQ/2P1NNP1/2P3B1/3K4/4R3 w - - 0 1)

Kock, WE

Magyar Sakkvilag, 1930

8/2nrP1r1/2p5/R2nk1qQ/2P1NNP1/2P3B1/3K4/4R3

#2

11 + 7

SOLUTION

  • SOUND
  • Sets
    • 1...Qf5
      • 2.Qxf5#
    • 1...Rxe7
      • 2.Qxg5#
    • 1...Rh7
      • 2.Qxg5#
  • Tries
    • 1.Sf2+?
      • 1...Kd6
        • 2.c5#
      • 1...Kf6!
    • 1.Sxg5+?
      • 1...Kd6
        • 2.Sxd5#
        • 2.c5#
      • 1...Kf6!
    • 1.Sd6+?
      • 1...Kxd6
        • 2.c5#
      • 1...Kf6!
    • 1.Sf6+?
      • 1...Kd6
        • 2.c5#
      • 1...Kxf6!
  • Keys
    • 1.Sc5+!
      • 1...Kd6
        • 2.Sb7#
      • 1...Kf6
        • 2.Sxd7#
      • 1...Se3+
        • 2.Sd5#

FEATURES

  • Static
    • TYPE = CHECKING_KEY
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 3
  • Sets
    • Q(c);N_PINS(G),OGATE::QAR1(J),XQ(c)
    • R(g);N_GUARD,XP(K)::QAR2(J),XQ(c)
    • R(g);N_GUARD::QAR2(J),XQ(c)
  • Tries
    • Try
      • S(F);CHECK
      • Vars
        • K(b);N_SPINQ(c),N_SPINS(a),S_FLIGHT::P(E)
      • Refutation
        • K(b);N_SPINQ(c),N_SPINS(a),S_FLIGHT
    • Try
      • S(F);CHECK,N_SPINS(G),XQ(c)
      • Refutation
        • K(b);N_SPINS(a),S_FLIGHT
    • Try
      • S(F);CHECK
      • Vars
        • K(b);N_SPINQ(c),N_SPINS(a),S_FLIGHT,XS(F)::P(E)
      • Refutation
        • K(b);N_SPINQ(c),N_SPINS(a),S_FLIGHT
    • Try
      • S(F);CHECK
      • Vars
        • K(b);N_SPINQ(c),N_SPINS(a),S_FLIGHT::P(E)
      • Refutation
        • K(b);N_SPINQ(c),N_SPINS(a),S_FLIGHT,XS(F)
  • Actual
    • S(F);CHECK,N_PINS(a)
    • Vars
      • K(b);N_SPINQ(c),S_FLIGHT::S(F)
      • K(b);N_SPINQ(c),S_FLIGHT::S(F),XR(f)
      • S(a);CHECK,N_PINS(G),P_SPINS(a)::B(D)+S(G)
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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).