MESON Chess Problem Database

Problem Display
PID: 11049 (8/K7/4n1p1/B4bk1/5n1R/4N1P1/1Q6/3B4 w - - 0 1)

Gerrard, TB

Chess, 1936

8/K7/4n1p1/B4bk1/5n1R/4N1P1/1Q6/3B4

#2

7 + 5

SOLUTION

  • SOUND
  • Sets
    • 1...Sd4
      • 2.Bd8#
    • 1...Sc5
      • 2.Bd8#
    • 1...Sg7
      • 2.Bd8#
    • 1...Sd8
      • 2.Bxd8#
    • 1...Sf8
      • 2.Bd8#
  • Tries
    • 1.Rg4+?
      • 1...Kh5
        • 2.Qh8#
      • 1...Kh6
        • 2.Qh8#
      • 1...Bxg4!
    • 1.gxf4+?
      • 1...Sxf4
        • 2.Bd8#
      • 1...Kxh4!
  • Keys
    • 1.Qg7!
      • threat
        • 2.Qe7#
      • 1...Sxg7
        • 2.Bd8#
      • 1...Sd5
        • 2.Rh5#
      • 1...Sh5
        • 2.Rxh5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 4
  • Sets
    • S(d);N_GUARD::B(F)
    • S(d);N_GUARD::B(F),XS(d)
  • Tries
    • Try
      • R(E);CHECK
      • Vars
        • K(c);P-FLIGHT::QAR(B)
        • K(c);S_FLIGHT::QAR2(B)
      • Refutation
        • B(b);XR(E)
    • Try
      • P(D);CHECK,XS(a)
      • Vars
        • S(d);XP(D)::B(F)
      • Refutation
        • K(c);S_FLIGHT,XR(E)
  • Actual
    • Q(B);P_PINP(e)
    • Threat
      • QAB(B)
    • Vars
      • S(d);N_GUARD,N_SPINP(e),XQ(B)::B(F)
      • S(a);N_GUARD::R1(E)
      • S(a);N_GUARD::R1(E),XS(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).