MESON Chess Problem Database

Problem Display
PID: 16444 (1n3N2/1q2n3/5p2/2P1kP1Q/2P3P1/5Pbr/1NBPb2p/BK2R3 w - - 0 1)

Craddock, R

Queenstown Daily Representative, 1940

1n3N2/1q2n3/5p2/2P1kP1Q/2P3P1/5Pbr/1NBPb2p/BK2R3

#2

13 + 9

SOLUTION

  • SOUND
  • Sets
    • 1...Qe4
      • 2.Sd3#
    • 1...Qd5
      • 2.Sd3#
    • 1...Qa6
      • 2.Sd3#
    • 1...Qc6
      • 2.Sd3#
    • 1...Qa8
      • 2.Sd3#
    • 1...Qc8
      • 2.Sd3#
    • 1...Qa7
      • 2.Sd3#
    • 1...Qc7
      • 2.Sd3#
    • 1...Qd7
      • 2.Sd3#
  • Tries
    • 1.Rxe2+?
      • 1...Kd4
        • 2.Se6#
      • 1...Qe4
        • 2.Sd3#
        • 2.Rxe4#
      • 1...Kf4!
  • Keys
    • 1.Se6!
      • threat
        • 2.d4#
      • 1...Qxb2+
        • 2.Bxb2#
      • 1...Sxf5
        • 2.Qxf5#
      • 1...Qe4
        • 2.Sd3#
      • 1...Qd5
        • 2.Sd3#
      • 1...Qd7
        • 2.Sd3#
        • 2.Rxe2#
      • 1...Bf2
        • 2.f4#
      • 1...Sec6
        • 2.Rxe2#
      • 1...Sbc6
        • 2.Rxe2#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 7
  • Sets
    • Q(g);N_PINS(D),N_SPINB(a),P_PINB(E)::B(A)+S(D),DCHECK
    • Q(g);N_PINS(D)::B(A)+S(D),DCHECK
  • Tries
    • Try
      • R(C);CHECK,XB(a)
      • Vars
        • K(e);S_FLIGHT::S(M)
      • Refutation
        • K(e);S_FLIGHT
  • Actual
    • S(M);
    • Threat
      • P(F)
    • Vars
      • Q(g);CHECK,OGATE,P_SPINQ(g),XS(D)::B(A),XQ(g)
      • S(h);OGATE,P_SPINS(h),XP(K)::QAR1(L),XS(h)
      • Q(g);N_PINS(D),N_SPINB(a),P_PINB(E)::B(A)+S(D),DCHECK
      • Q(g);N_PINS(D)::B(A)+S(D),DCHECK
      • B(c);N_GUARD::P(G)
      • S(h);S_CUTQ(g)::R(C),XB(a)
      • S(i);S_CUTQ(g)::R(C),XB(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).