MESON Chess Problem Database

Problem Display
PID: 193966 (r3R1b1/p1rp1kPp/2B1N1pP/KN3qp1/2Q2R1B/8/8/8 w - - 0 1)

Watson, Charles Gilbert Marriott

Brisbane Courier, 1916

r3R1b1/p1rp1kPp/2B1N1pP/KN3qp1/2Q2R1B/8/8/8

#2

10 + 10

6490 yacpdb 2019

SOLUTION

  • SOUND
  • Sets
    • 1...Qf6
      • 2.Sd6#
    • 1...gxf4
      • 2.Re7#
    • 1...g4
      • 2.Re7#
    • 1...dxe6
      • 2.Qxe6#
  • Tries
    • 1.Sxg5+?
      • 1...Kf6
        • 2.Se4#
        • 2.Sxh7#
        • 2.Qc3#
        • 2.Qd4#
      • 1...Kxe8!
    • 1.Sd8+?
      • 1...Kf6
        • 2.Qc3#
        • 2.Qd4#
      • 1...Kxe8!
    • 1.Rf8+?
      • 1...Rxf8
        • 2.gxf8Q#
      • 1...Ke7!
  • Keys
    • 1.Bxg5!
      • threat
        • 2.Re7#
      • 1...Kxe8
        • 2.Sxc7#
      • 1...Rxe8
        • 2.Sd8#
      • 1...dxc6
        • 2.Sxc7#
      • 1...dxe6
        • 2.Qxe6#
      • 1...d5
        • 2.Sd6#
      • 1...Qf6
        • 2.Sd6#
      • 1...d6
        • 2.Sd8#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 2
  • Sets
    • Q(a);N_PINS(E)::S(E)
    • P(b);N_SPINQ(a),XR(B)::R1(J)
    • P(b);::R1(J)
    • P(f);OGATE,P_SPINP(f),XS(G)::QAB1(A),XP(f)
  • Tries
    • Try
      • S(G);CHECK,XP(b)
      • Refutation
        • K(g);N_SPINQ(a),P_SPINP(f),S_FLIGHT,XR(J)
    • Try
      • S(G);CHECK
      • Refutation
        • K(g);N_SPINQ(a),P_SPINP(f),S_FLIGHT,XR(J)
    • Try
      • R(J);CHECK
      • Vars
        • R(i);OGATE,XR(J)::PXR(i)=Q
      • Refutation
        • K(g);N_SPINQ(a),P-FLIGHT,P_SPINP(b)
  • Actual
    • B(C);XP(b)
    • Threat
      • R1(J)
    • Vars
      • K(g);N_SPINQ(a),P_SPINP(f),S_FLIGHT,XR(J)::S(G),XR(e)
      • R(i);SBLOCK,XR(J)::QAB(A)+S(G),DCHECK
      • P(f);N_GUARD,XB(F)::QAB(A)+S(G),XR(e)
      • P(f);OGATE,P_SPINP(f),XS(G)::QAB1(A),XP(f)
      • P(f);N_PINS(E)::S(E)
      • Q(a);N_PINS(E)::S(E)
      • P(f);::QAB(A)+S(G),DCHECK
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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).