MESON Chess Problem Database

Problem Display
PID: 45453 (8/K3N3/1Q4p1/1p4p1/pP2k1N1/4rbp1/2P5/2Bn1Rb1 w - - 0 1)

Stevenson, Edward

Double Pin-Mate after a Black King Move, 1980

8/K3N3/1Q4p1/1p4p1/pP2k1N1/4rbp1/2P5/2Bn1Rb1

#2

8 + 10

SOLUTION

  • SOUND
  • Sets
    • 1...Kf4
      • 2.Qd4#
    • 1...Sf2
      • 2.Qxe3#
  • Tries
    • 1.Sf6+?
      • 1...Kf4
        • 2.Qd4#
        • 2.Qc7#
        • 2.Qd6#
        • 2.Qb8#
      • 1...Ke5!
    • 1.Qc6+?
      • 1...Kf4
        • 2.Qxf3#
      • 1...Kd4!
    • 1.Qe6+?
      • 1...Kf4
        • 2.Sd5#
        • 2.Sxg6#
      • 1...Kd4!
    • 1.Qxg6+?
      • 1...Kf4
        • 2.Qf5#
      • 1...Kd4!
    • 1.Qb7+?
      • 1...Kf4
        • 2.Qxf3#
      • 1...Kd4!
  • Keys
    • 1.Qc5!
      • threat
        • 2.Qe5#
      • 1...Kf4
        • 2.Qd4#
      • 1...Bxg4
        • 2.Qd5#
      • 1...Re1
        • 2.Sf6#
      • 1...Re2
        • 2.Sf6#
      • 1...Ra3
        • 2.Sf6#
      • 1...Rb3
        • 2.Sf6#
      • 1...Rc3
        • 2.Sf6#
      • 1...Rd3
        • 2.Sf6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 7
    • REMOVED MATES = 1
  • Sets
    • K(g);P-FLIGHT,P_SPINB(d),P_SPINR(c)::QAR2(F)
    • S(a);N_GUARD,S_CUTB(b)::QAR1(F),XR(c)
  • Tries
    • Try
      • S(E);CHECK
      • Refutation
        • K(g);P-FLIGHT
    • Try
      • Q(F);CHECK
      • Vars
        • K(g);OGATE,P-FLIGHT,P_SPINB(d),P_SPINR(c)::QAR1(F),XB(d)
      • Refutation
        • K(g);P-FLIGHT
    • Try
      • Q(F);CHECK
      • Refutation
        • K(g);P-FLIGHT
    • Try
      • Q(F);CHECK,XP(j)
      • Vars
        • K(g);P-FLIGHT,P_SPINB(d),P_SPINR(c)::QAR1(F)
      • Refutation
        • K(g);P-FLIGHT
    • Try
      • Q(F);CHECK
      • Vars
        • K(g);OGATE,P-FLIGHT,P_SPINB(d),P_SPINR(c)::QAR1(F),XB(d)
      • Refutation
        • K(g);P-FLIGHT
  • Actual
    • Q(F);
    • Threat
      • QAR1(F)
    • Vars
      • K(g);P-FLIGHT,P_SPINB(d),P_SPINR(c)::QAR2(F)
      • B(d);XS(E)::QAB1(F)
      • R(c);P_PINQ(F)::S(E)
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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).