MESON Chess Problem Database

Problem Display
PID: 45206 (1BR1R1b1/Np6/p1pbnp2/8/3k1p2/pP3B2/K3P2p/2Q5 w - - 0 1)

Stevenson, Edward

Double Pin-Mate after a Black King Move, 1980

1BR1R1b1/Np6/p1pbnp2/8/3k1p2/pP3B2/K3P2p/2Q5

#2

9 + 11

SOLUTION

  • SOUND
  • Sets
    • 1...Ke5
      • 2.Qc5#
    • 1...Bc5
      • 2.Qd2#
    • 1...Sc5
      • 2.Qa1#
    • 1...b5
      • 2.Sxc6#
    • 1...b6
      • 2.Sxc6#
  • Tries
    • 1.Sb5+?
      • 1...Ke5
        • 2.Qc5#
      • 1...cxb5
        • 2.Qc3#
      • 1...axb5!
    • 1.Bxd6?
      • threat
        • 2.Qd2#
      • 1...Sc5
        • 2.Bxc5#
        • 2.Qa1#
        • 2.Qxc5#
      • 1...Bh7!
    • 1.Qc4+?
      • 1...Ke5
        • 2.Qe4#
        • 2.Qc5#
      • 1...Ke3!
  • Keys
    • 1.Rxc6!
      • threat
        • 2.Qc3#
      • 1...Ke5
        • 2.Qc5#
      • 1...bxc6
        • 2.Sxc6#
      • 1...Bb4
        • 2.Rc4#
      • 1...Bc5
        • 2.Qd2#
      • 1...Sc5
        • 2.Qa1#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 2
  • Sets
    • K(c);P_SPINB(g),P_SPINS(h),S_FLIGHT::QAR2(A)
    • B(g);SBLOCK::QAR2(A)
    • S(h);P_PINP(D),SBLOCK::QAB(A)
    • P(j);N_GUARD::S(F),XP(f)
  • Tries
    • Try
      • S(F);CHECK
      • Vars
        • K(c);P_SPINB(g),P_SPINS(h),S_FLIGHT::QAR2(A)
        • P(f);XS(F)::QAB1(A)
      • Refutation
        • P(e);XS(F)
    • Try
      • B(G);XB(g)
      • Threat
        • QAR2(A)
      • Refutation
        • B(k);
    • Try
      • Q(A);CHECK
      • Refutation
        • K(c);P_SPINS(h),S_FLIGHT
  • Actual
    • R(H);XP(f)
    • Threat
      • QAB1(A)
    • Vars
      • K(c);P_SPINB(g),P_SPINS(h),S_FLIGHT::QAR2(A)
      • P(j);XR(H)::S(F),XP(j)
      • B(g);::R1(H)
      • B(g);::QAR2(A)
      • S(h);P_PINP(D)::QAB(A)
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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).