MESON Chess Problem Database

Problem Display
PID: 45344 (8/BB1p4/2p1ppN1/R1n1b2R/4k3/2P1p3/K3Q3/8 w - - 0 1)

Stevenson, Edward

Double Pin-Mate after a Black King Move, 1980

8/BB1p4/2p1ppN1/R1n1b2R/4k3/2P1p3/K3Q3/8

#2

8 + 8

SOLUTION

  • SOUND
  • Sets
    • 1...Kd5
      • 2.Qd3#
    • 1...Sb3
      • 2.Qxe3#
    • 1...Sd3
      • 2.Qg2#
      • 2.Qxe3#
    • 1...Sa4
      • 2.Qxe3#
    • 1...Sa6
      • 2.Qxe3#
    • 1...Sxb7
      • 2.Qxe3#
  • Tries
    • 1.Ra4+?
      • 1...Kd5
        • 2.Rd4#
      • 1...Bd4
        • 2.Rxd4#
      • 1...Sxa4!
    • 1.Qc2+?
      • 1...Kd5
        • 2.Qd3#
      • 1...Sd3
        • 2.Qg2#
      • 1...Kf3!
    • 1.Qxe3+?
      • 1...Kd5
        • 2.Qd4#
        • 2.Qd3#
      • 1...Kxe3!
  • Keys
    • 1.Ba6!
      • threat
        • 2.Qg2#
      • 1...Kd5
        • 2.Qd3#
      • 1...Bxc3
        • 2.Qg4#
      • 1...Sxa6
        • 2.Qxe3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 3
  • Sets
    • K(b);N_SPINP(a),P_SPINB(d),P_SPINP(e),P_SPINS(c),S_FLIGHT::QAR2(B)
    • S(c);::QAR1(B),XP(a)
    • S(c);XB(H)::QAR1(B),XP(a)
  • Tries
    • Try
      • R(D);CHECK
      • Vars
        • K(b);N_SPINP(a),P_SPINB(d),P_SPINP(e),S_FLIGHT::R1(D)
        • B(d);N_GUARD,P_SPINB(d)::R1(D),XB(d)
      • Refutation
        • S(c);XR(D)
    • Try
      • Q(B);CHECK,N_PINP(a),P_PINP(e)
      • Vars
        • K(b);P_SPINB(d),P_SPINS(c),S_FLIGHT::QAR2(B)
        • S(c);P_SPINS(c),SBLOCK::QAB(B)
      • Refutation
        • K(b);S_FLIGHT
    • Try
      • Q(B);CHECK,P_PINP(e),XP(a)
      • Refutation
        • K(b);N_SPINP(e),P-FLIGHT,P_SPINS(c),XQ(B)
  • Actual
    • B(H);
    • Threat
      • QAB(B)
    • Vars
      • K(b);N_SPINP(a),P_SPINB(d),P_SPINS(c),S_FLIGHT::QAR2(B)
      • B(d);N_GUARD,XP(C)::QAR2(B)
      • S(c);XB(H)::QAR1(B),XP(a)
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).