MESON Chess Problem Database

Problem Display
PID: 139986 (kB2N1R1/1n5K/1P6/7p/N6r/8/6rq/R5bB w - - 0 1)

Boorer, PA

The Problemist, 1938

kB2N1R1/1n5K/1P6/7p/N6r/8/6rq/R5bB

#2

8 + 7

SOLUTION

  • SOUND
  • Sets
    • 1...Qc7+
      • 2.Sxc7#
    • 1...Qxb8
      • 2.Sc7#
    • 1...Qxh1
      • 2.Sc7#
    • 1...Qh3
      • 2.Sc7#
    • 1...Rg3
      • 2.Sc7#
    • 1...Rf4
      • 2.Sc7#
  • Tries
    • 1.Bg3?
      • threat
        • 2.Sc7#
      • 1...Bxb6
        • 2.Sxb6#
      • 1...Sa5
        • 2.Sd6#
      • 1...Sc5
        • 2.Sd6#
      • 1...Sd6
        • 2.Sxd6#
      • 1...Sd8!
  • Keys
    • 1.Bf4!
      • threat
        • 2.Sc7#
      • 1...Rg7+
        • 2.Sxg7#
      • 1...Rxg8
        • 2.Sb2#
      • 1...Bxb6
        • 2.Sxb6#
      • 1...Sa5
        • 2.Sd6#
      • 1...Sc5
        • 2.Sxc5#
        • 2.Sd6#
      • 1...Sd6
        • 2.Sxd6#
      • 1...Sd8
        • 2.Sc5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 6
    • REMOVED MATES = 6
  • Sets
    • Q(c);CHECK,N_GUARD::S(G),XQ(c)
    • Q(c);N_GUARD,XB(F)::S(G)
    • Q(c);N_GUARD,XB(B)::S(G)
    • Q(c);N_GUARD::S(G)
    • R(b);P_SPINS(f),S_CUTQ(c)::S(G)
    • R(d);S_CUTQ(c)::S(G)
  • Tries
    • Try
      • B(F);
      • Threat
        • R(H)+S(G),DCHECK
      • Vars
        • B(a);XP(D)::R(A)+S(C),DCHECK,XB(a)
        • S(f);N_GUARD,P_SPINR(b)::R(H)+S(G)
        • S(f);N_GUARD,P_SPINR(b)::R(H)+S(G),XS(f)
      • Refutation
        • S(f);P_SPINR(b)
  • Actual
    • B(F);
    • Threat
      • R(H)+S(G),DCHECK
    • Vars
      • R(b);CHECK,P_SPINS(f)::R(H)+S(G),XR(b)
      • R(b);P_SPINS(f),XR(H)::R(A)+S(C)
      • B(a);XP(D)::R(A)+S(C),DCHECK,XB(a)
      • S(f);N_GUARD,P_SPINR(b)::R(H)+S(G)
      • S(f);N_GUARD,P_SPINR(b)::R(H)+S(G),XS(f)
      • S(f);N_GUARD,P_SPINR(b)::R(A)+S(C)
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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).