MESON Chess Problem Database

Problem Display
PID: 262771 (R7/1k1N1Q2/2q5/8/8/3K4/6B1/8 w - - 0 1)

Myhre, Gunnar Frode

Szachy, 1975

R7/1k1N1Q2/2q5/8/8/3K4/6B1/8

#2

5 + 2

6490 yacpdb 2022

SOLUTION

  • SOUND
  • Tries
    • 1.Ra7+?
      • 1...Kc8
        • 2.Qe8#
        • 2.Qg8#
        • 2.Qf8#
      • 1...Kxa7!
    • 1.Qb3+?
      • 1...Kxa8
        • 2.Qb8#
      • 1...Kc7!
    • 1.Qf4?
      • threat
        • 2.Qb8#
      • 1...Qf3+
        • 2.Bxf3#
      • 1...Qe4+
        • 2.Bxe4#
      • 1...Qd5+
        • 2.Bxd5#
      • 1...Kxa8
        • 2.Qb8#
      • 1...Qxg2!
  • Keys
    • 1.Qc4!
      • threat
        • 2.Qxc6#
      • 1...Qf3+
        • 2.Bxf3#
      • 1...Qe4+
        • 2.Bxe4#
      • 1...Qd5+
        • 2.Bxd5#
      • 1...Kc7
        • 2.Qxc6#
      • 1...Kxa8
        • 2.Qa6#
      • 1...Qxg2
        • 2.Qc8#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 6
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • R(E);CHECK
      • Refutation
        • K(b);N_SPINQ(a),P-FLIGHT,XR(E)
    • Try
      • Q(D);CHECK
      • Vars
        • K(b);OGATE,S_FLIGHT,XR(E)::QAR1(D)
      • Refutation
        • K(b);N_SPINQ(a),P-FLIGHT
    • Try
      • Q(D);
      • Threat
        • QAR1(D)
      • Vars
        • Q(a);CHECK,OGATEB::B(A),XQ(a)
        • K(b);S_FLIGHT,XR(E)::QAR1(D)
      • Refutation
        • Q(a);N_SPINQ(a),XB(A)
  • Actual
    • Q(D);
    • Threat
      • QAB1(D),XQ(a)
    • Vars
      • Q(a);CHECK,OGATEB::B(A),XQ(a)
      • K(b);P-FLIGHT::QAR1(D),XQ(a)
      • K(b);N_GUARD,S_FLIGHT,XR(E)::QAR2(D)
      • Q(a);N_SPINQ(a),OGATE,XB(A)::QAB1(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).