MESON Chess Problem Database

Problem Display
PID: 56667 (7Q/b1BbK3/r7/RN1kp1n1/BR6/2PP4/n7/4q3 w - - 0 1)

Laquier, EM

Bulletin de la FFE, 1922

7Q/b1BbK3/r7/RN1kp1n1/BR6/2PP4/n7/4q3

#2

9 + 8

SOLUTION

  • SOUND
  • Sets
    • 1...Qxc3
      • 2.Sxc3#
    • 1...Sxc3
      • 2.Sxc3#
  • Tries
    • 1.Sxa7+?
      • 1...Bb5
        • 2.Rbxb5#
        • 2.Raxb5#
      • 1...Rxa5!
    • 1.Bd6?
      • threat
        • 2.Sc7#
      • 1...Kc6
        • 2.Sa3#
        • 2.Sd4#
        • 2.Sxa7#
        • 2.Sc7#
      • 1...Bxb5!
    • 1.Qxe5+?
      • 1...Kc6
        • 2.Sa3#
        • 2.Sd4#
        • 2.Sxa7#
      • 1...Qxe5+!
    • 1.Qa8+?
      • 1...Kc5
        • 2.Rc4#
      • 1...Rc6
        • 2.Sxa7#
      • 1...Bc6!
  • Keys
    • 1.Bb6!
      • threat
        • 2.Sc7#
      • 1...Kc6
        • 2.Sd6#
      • 1...Bxb5
        • 2.Qa8#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 2
  • Sets
    • Q(a);XP(A)::R(E)+S(F),DCHECK,XQ(a)
    • S(b);XP(A)::R(E)+S(F),DCHECK,XS(b)
  • Tries
    • Try
      • S(F);CHECK,XB(g)
      • Refutation
        • R(f);XR(E)
    • Try
      • B(G);
      • Threat
        • R(E)+S(F),DCHECK
      • Refutation
        • B(h);P_SPINB(h),XS(F)
    • Try
      • Q(I);CHECK,P_SPINQ(I),XP(d)
      • Refutation
        • Q(a);CHECK,XQ(I)
    • Try
      • Q(I);CHECK
      • Vars
        • K(c);P-FLIGHT::R1(D)
        • R(f);P_SPINR(f)::R(E)+S(F),XB(g)
      • Refutation
        • B(h);P_SPINB(h)
  • Actual
    • B(G);
    • Threat
      • R(E)+S(F),DCHECK
    • Vars
      • K(c);S_FLIGHT::B(C)+S(F)
      • B(h);N_GUARD,P_SPINB(h),XS(F)::QAB(I)
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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).