MESON Chess Problem Database

Problem Display
PID: 51417 (6K1/6B1/pp1p4/5Q2/p1kP2p1/1bP5/1R2P3/8 w - - 0 1)

Lyness, Robert Cranston

The Guardian, 1959

6K1/6B1/pp1p4/5Q2/p1kP2p1/1bP5/1R2P3/8

#2

7 + 7

SOLUTION

  • SOUND
  • Sets
    • 1...d5
      • 2.Qd3#
  • Tries
    • 1.Qe6+?
      • 1...Kb5
        • 2.Qd5#
      • 1...d5
        • 2.Qc6#
      • 1...Kxc3!
    • 1.Qf3?
      • threat
        • 2.Qc6#
      • 1...Kb5+
        • 2.Qd5#
      • 1...d5
        • 2.Qd3#
      • 1...gxf3!
  • Keys
    • 1.Qe4!
      • threat
        • 2.Qc6#
      • 1...Kxc3+
        • 2.d5#
      • 1...Kb5+
        • 2.Qd5#
      • 1...d5
        • 2.Qd3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • P(g);SBLOCK::QAB1(E)
  • Tries
    • Try
      • Q(E);CHECK
      • Vars
        • K(c);P_PINQ(E),P_SPINB(a),S_FLIGHT::QAR2(E)
        • P(g);OGATE,P_SPINP(g)::QAR2(E)
      • Refutation
        • K(c);P-FLIGHT,P_PINQ(E),XP(C)
    • Try
      • Q(E);
      • Threat
        • QAR2(E)
      • Vars
        • K(c);CHECK,P_SPINB(a),S_FLIGHT::QAR2(E)
        • P(g);SBLOCK::QAB1(E)
      • Refutation
        • P(d);XQ(E)
  • Actual
    • Q(E);
    • Threat
      • QAR2(E)
    • Vars
      • K(c);CHECK,P-FLIGHT,XP(C)::B(F)+P(D)
      • K(c);CHECK,P_SPINB(a),S_FLIGHT::QAR2(E)
      • P(g);SBLOCK::QAB1(E)
HTML5 logo

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).