MESON Chess Problem Database

Problem Display
PID: 27219 (k7/q1bN4/R7/2P5/4K3/8/8/1Q6 w - - 0 1)

Lebeck, Donald

Mate in Two!! (Lebeck), 1992

k7/q1bN4/R7/2P5/4K3/8/8/1Q6

#2

5 + 3

SOLUTION

  • SOUND
  • Sets
    • 1...Ba5
      • 2.Qb8#
    • 1...Bb8
      • 2.Qxb8#
    • 1...Bd8
      • 2.Qb8#
  • Tries
    • 1.Qa2?
      • threat
        • 2.Rxa7#
        • 2.Qd5#
      • 1...Qxa6
        • 2.Qxa6#
      • 1...Ba5
        • 2.Qd5#
      • 1...Bb6
        • 2.Qd5#
      • 1...Bb8
        • 2.Qd5#
      • 1...Kb7!
    • 1.Qd3?
      • threat
        • 2.Qd5#
      • 1...Qxa6
        • 2.Qxa6#
      • 1...Kb7!
    • 1.Qb6?
      • threat
        • 2.Rxa7#
        • 2.Qxa7#
        • 2.Qc6#
      • 1...Qxa6
        • 2.Qxa6#
      • 1...Bb8
        • 2.Qc6#
        • 2.Qxb8#
      • 1...Bxb6!
  • Keys
    • 1.Qb5!
      • threat
        • 2.Qc6#
      • 1...Qxa6
        • 2.Qxa6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 3
  • Sets
    • B(b);N_GUARD::QAR1(A)
    • B(b);N_GUARD::QAR1(A),XB(b)
  • Tries
    • Try
      • Q(A);
      • Threat
        • DUALS(2)
      • Vars
        • Q(a);OGATE,XR(D)::QAR2(A),XQ(a)
        • B(b);::QAB(A)
      • Refutation
        • K(c);N_SPINQ(a),S_FLIGHT
    • Try
      • Q(A);
      • Threat
        • QAB(A)
      • Vars
        • Q(a);N_SPINQ(a),OGATE,XR(D)::QAR2(A),XQ(a)
      • Refutation
        • K(c);N_SPINQ(a),S_FLIGHT
    • Try
      • Q(A);
      • Threat
        • DUALS(3)
      • Vars
        • Q(a);N_SPINQ(a),OGATE,XR(D)::QAR2(A),XQ(a)
      • Refutation
        • B(b);XQ(A)
  • Actual
    • Q(A);
    • Threat
      • QAB(A)
    • Vars
      • Q(a);N_SPINQ(a),OGATE,XR(D)::QAR2(A),XQ(a)
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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).