MESON Chess Problem Database

Problem Display
PID: 45457 (K1R5/4N3/N3Rp2/4b3/1p1k2p1/p4rP1/1n2Pn2/BQ5B w - - 0 1)

Stevenson, Edward

Double Pin-Mate after a Black King Move, 1980

K1R5/4N3/N3Rp2/4b3/1p1k2p1/p4rP1/1n2Pn2/BQ5B

#2

10 + 9

SOLUTION

  • SOUND
  • Sets
    • 1...Rb3
      • 2.Sf5#
    • 1...Rc3
      • 2.Sf5#
    • 1...Rd3
      • 2.Sf5#
    • 1...Re3
      • 2.Sf5#
    • 1...Rxg3
      • 2.Sf5#
    • 1...Rf5
      • 2.Sxf5#
  • Tries
    • 1.Qd3+?
      • 1...Rxd3
        • 2.Sf5#
      • 1...Sxd3!
    • 1.e3+?
      • 1...Rxe3
        • 2.Sf5#
      • 1...Kxe3!
  • Keys
    • 1.Qc1!
      • threat
        • 2.Rc4#
      • 1...Ke4
        • 2.Qf4#
      • 1...Rc3
        • 2.Sf5#
      • 1...Bc7
        • 2.Qc5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 5
  • Sets
    • R(d);N_GUARD::S(H)
    • R(d);N_GUARD,N_SPINS(a)::S(H)
    • R(d);N_GUARD,XP(E)::S(H)
    • R(d);N_GUARD::S(H),XR(d)
  • Tries
    • Try
      • Q(B);CHECK
      • Vars
        • R(d);XQ(B)::S(H)
      • Refutation
        • S(b);XQ(B)
    • Try
      • P(D);CHECK
      • Vars
        • R(d);XP(D)::S(H)
      • Refutation
        • K(f);N_SPINS(a),P_SPINB(h),S_FLIGHT,XP(D)
  • Actual
    • Q(B);
    • Threat
      • R1(J)
    • Vars
      • K(f);N_SPINS(a),P-FLIGHT,P_SPINB(h),P_SPINR(d)::QAR1(B)
      • R(d);N_GUARD,N_SPINS(a)::S(H)
      • B(h);::QAB1(B)
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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).