MESON Chess Problem Database

Problem Display
PID: 45467 (K2N3N/p3p1bp/3pP3/1R1pk1P1/4r1bP/rp1p2PB/1R6/B4Q2 w - - 0 1)

Stevenson, Edward

Double Pin-Mate after a Black King Move, 1980

K2N3N/p3p1bp/3pP3/1R1pk1P1/4r1bP/rp1p2PB/1R6/B4Q2

#2

12 + 12

SOLUTION

  • SOUND
  • Sets
    • 1...Re1
      • 2.Re2#
      • 2.Qf4#
    • 1...Re2
      • 2.Rxe2#
      • 2.Qf4#
    • 1...Re3
      • 2.Qf4#
    • 1...Ra4
      • 2.Re2#
    • 1...Rb4
      • 2.Re2#
    • 1...Rc4
      • 2.Re2#
    • 1...Rf4
      • 2.Qxf4#
    • 1...Bd1
      • 2.Sc6#
    • 1...Be2
      • 2.Sc6#
    • 1...Bf3
      • 2.Sc6#
    • 1...Bh5
      • 2.Sc6#
    • 1...Bxe6
      • 2.Sc6#
  • Tries
    • 1.Ra2+?
      • 1...Rd4
        • 2.Qf4#
      • 1...b2!
    • 1.R2xb3+?
      • 1...Rd4
        • 2.Qf4#
      • 1...Rxa1!
  • Keys
    • 1.Qxd3!
      • threat
        • 2.Rxd5#
        • 2.Qxd5#
      • 1...Kf5
        • 2.Rf2#
      • 1...Bxe6
        • 2.Sc6#
      • 1...Ra5
        • 2.Qxd5#
      • 1...Rd4
        • 2.Shf7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 9
  • Sets
    • R(d);N_GUARD::QAB1(B)
    • R(d);::B(A)+R(C),DCHECK
    • R(d);N_GUARD::QAB1(B),XR(d)
    • B(e);::S(K)
    • B(e);XP(I)::S(K)
  • Tries
    • Try
      • R(C);CHECK
      • Vars
        • R(d);P_SPINR(d)::QAB1(B)
      • Refutation
        • P(b);N_SPINP(f),P_SPINP(b)
    • Try
      • R(C);CHECK,XP(b)
      • Vars
        • R(d);P_SPINR(d)::QAB1(B)
      • Refutation
        • R(a);XB(A)
  • Actual
    • Q(B);XP(c)
    • Threat
      • DUALS(2)
    • Vars
      • K(g);P-FLIGHT,P_SPINB(e),P_SPINR(d)::R(C)
      • B(e);XP(I)::S(K)
      • R(a);::QAR1(B),XP(f)
      • R(d);::S(L)
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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).