MESON Chess Problem Database

Problem Display
PID: 96742 (nbk2nbR/8/P1NpP3/1N6/5p1r/7p/2Q5/1K6 w - - 0 1)

Thomson, Robert Gavin

The Chess Problem, 1944

nbk2nbR/8/P1NpP3/1N6/5p1r/7p/2Q5/1K6

#2

7 + 9

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Bc7
      • 2.Sba7#
    • 1...Bh7
      • 2.Rxf8#
    • 1...Sc7
      • 2.Sxd6#
  • Tries
    • 1.Rxg8?
      • threat
        • 2.Rxf8#
      • 1...Bc7
        • 2.Sba7#
      • 1...Sc7
        • 2.Sxd6#
      • 1...Rh8!
  • Keys
    • 1.Qf5!
      • threat
        • 2.Qxf8#
      • 1...Bxe6
        • 2.Qxe6#
      • 1...Sxe6
        • 2.Qxe6#
      • 1...Bc7
        • 2.Sba7#
      • 1...Bf7
        • 2.exf7#
      • 1...Bh7
        • 2.Rxf8#
      • 1...Sc7
        • 2.Sxd6#
      • 1...Sg6
        • 2.e7#
      • 1...Sd7
        • 2.exd7#
      • 1...Sh7
        • 2.e7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 6
    • REMOVED MATES = 0
  • Sets
    • B(f);N_GUARD,SBLOCK::S(C)
    • B(i);OGATE,P_PINQ(B),P_SPINS(h)::R(G),XS(h)
    • S(e);SBLOCK,S_CUTB(f)::S(C),XP(d)
  • Tries
    • Try
      • R(G);P_PINS(h),XB(i)
      • Threat
        • R(G),XS(h)
      • Vars
        • B(f);N_GUARD,SBLOCK::S(C)
        • S(e);SBLOCK,S_CUTB(f)::S(C),XP(d)
      • Refutation
        • R(c);
  • Actual
    • Q(B);
    • Threat
      • QAR(B),XS(h)
    • Vars
      • B(i);OGATE,P_SPINB(i),P_SPINS(h),XP(F)::QAB(B),XB(i)
      • S(h);OGATE,P_SPINB(i),P_SPINS(h),XP(F)::QAB(B),XS(h)
      • B(f);N_GUARD,SBLOCK::S(C)
      • B(i);OGATE,P_SPINS(h)::QAB(B)+P(F),XB(i)
      • B(i);OGATE,P_PINQ(B),P_SPINS(h)::R(G),XS(h)
      • S(e);SBLOCK,S_CUTB(f)::S(C),XP(d)
      • S(h);N_GUARD,P_SPINB(i)::QAB(B)+P(F)
      • S(h);OGATE,P_SPINB(i)::P(F),XS(h)
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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).