MESON Chess Problem Database

Problem Display
PID: 11964 (1KB4n/8/1N1N2p1/2p1k3/3r2P1/2n5/1B3Q2/8 w - - 0 1)

Boudantsev, Alex

The Problemist, 1973

1KB4n/8/1N1N2p1/2p1k3/3r2P1/2n5/1B3Q2/8

#2

7 + 6

SOLUTION

  • SOUND
  • Sets
    • 1...Kxd6
      • 2.Qf6#
    • 1...Rd5
      • 2.Sbc4#
    • 1...Se4
      • 2.Sdc4#
    • 1...Sd5
      • 2.Sbc4#
  • Tries
    • 1.Sdc4+?
      • 1...Ke4
        • 2.Qe3#
      • 1...Rxc4!
    • 1.Qf5+?
      • 1...Kxd6
        • 2.Qe6#
        • 2.Qf6#
      • 1...gxf5!
  • Keys
    • 1.g5!
      • threat
        • 2.Qf6#
      • 1...Kxd6
        • 2.Qf6#
      • 1...Rxd6
        • 2.Qe3#
      • 1...Rf4
        • 2.Qxc5#
      • 1...Se4
        • 2.Sdc4#
      • 1...Sd5
        • 2.Sbc4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 1
  • Sets
    • K(d);S_FLIGHT,XS(E)::QAR2(B)
    • R(b);N_GUARD,P_SPINS(a),SBLOCK::S(D)
    • S(a);P_SPINR(b),SBLOCK::S(E)
    • S(a);P_SPINR(b),SBLOCK::S(D)
  • Tries
    • Try
      • S(E);CHECK
      • Vars
        • K(d);P-FLIGHT::QAR1(B)
      • Refutation
        • R(b);P_SPINS(a),XS(E)
    • Try
      • Q(B);CHECK
      • Refutation
        • P(e);XQ(B)
  • Actual
    • P(C);
    • Threat
      • QAB1(B)
    • Vars
      • K(d);S_FLIGHT,XS(E)::QAR2(B)
      • R(b);N_GUARD,P_SPINS(a),SBLOCK,XS(E)::QAR2(B)
      • R(b);OGATE,P_SPINS(a),SBLOCK::QAR2(B),XP(c)
      • S(a);P_SPINR(b),SBLOCK::S(E)
      • S(a);P_SPINR(b),SBLOCK::S(D)
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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).