MESON Chess Problem Database

Problem Display
PID: 27358 (1N2k3/6B1/8/K1Q1q3/4R3/8/8/8 w - - 0 1)

Neyndorff, Luke

3rd Sp. Comm., StrateGems, 2001

1N2k3/6B1/8/K1Q1q3/4R3/8/8/8

#2

5 + 2

145 StrateGems 2003
5454 Near Snap 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Qxe4
      • 2.Qf8#
    • 1...Qe6
      • 2.Qf8#
    • 1...Qe7
      • 2.Qxe7#
  • Tries
    • 1.Bxe5?
      • 1...Kd8
        • 2.Bf6#
        • 2.Qf8#
      • 1...Kf7!
    • 1.Rxe5+?
      • 1...Kd8
        • 2.Bf6#
      • 1...Kf7!
  • Keys
    • 1.Qd5!
      • threat
        • 2.Rxe5#
      • 1...Ke7
        • 2.Rxe5#
      • 1...Qxe4
        • 2.Qd7#
      • 1...Qe6
        • 2.Qd7#
      • 1...Qe7
        • 2.Qg8#

Anticipated by 232981(2000)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 3
    • ADDED MATES = 1
    • REMOVED MATES = 0
  • Sets
    • Q(a);N_PINQ(C),N_SPINQ(a),XR(A)::QAR1(C)
    • Q(a);N_PINQ(C)::QAR1(C)
    • Q(a);N_PINQ(C)::QAR1(C),XQ(a)
  • Tries
    • Try
      • B(D);N_SPINQ(C),XQ(a)
      • Refutation
        • K(b);S_FLIGHT
    • Try
      • R(A);CHECK,N_SPINQ(C),XQ(a)
      • Vars
        • K(b);P-FLIGHT::B(D)
      • Refutation
        • K(b);S_FLIGHT
  • Actual
    • Q(C);
    • Threat
      • R(A),XQ(a)
    • Vars
      • K(b);P-FLIGHT::R(A),XQ(a)
      • Q(a);N_PINQ(C),N_SPINQ(a),XR(A)::QAB1(C)
      • Q(a);N_PINQ(C)::QAB1(C)
      • Q(a);N_PINQ(C)::QAR2(C)
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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).