MESON Chess Problem Database

Problem Display
PID: 206290 (rR1BbbK1/2Pk1n1Q/1n1P2Pp/2PP3p/6r1/7B/8/8 w - - 0 1)

Howard, Kenneth Samuel

Pittsburgh Post, 1925

rR1BbbK1/2Pk1n1Q/1n1P2Pp/2PP3p/6r1/7B/8/8

#2

10 + 9

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Bxd6
      • 2.c6#
    • 1...Sa4
      • 2.c8Q#
    • 1...Sc4
      • 2.c8Q#
    • 1...Sxd5
      • 2.c8Q#
    • 1...h4
      • 2.Bxg4#
  • Tries
    • 1.Qxf7+?
      • 1...Be7
        • 2.Qe6#
        • 2.Qf5#
        • 2.Qxe7#
      • 1...Bxf7+!
  • Keys
    • 1.g7!
      • threat
        • 2.Qf5#
      • 1...Sxd5
        • 2.c8Q#
      • 1...Sxd6
        • 2.c6#
      • 1...Sxd8
        • 2.cxd8Q#
        • 2.cxd8R#
      • 1...Sg5
        • 2.gxf8S#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 4
  • Sets
    • B(i);SBLOCK,XP(D)::P(B)
    • S(c);N_GUARD::P=Q
    • S(c);N_GUARD,XP(C)::P=Q
    • P(b);N_GUARD::B(A),XR(a)
  • Tries
    • Try
      • Q(G);CHECK,XS(f)
      • Refutation
        • B(h);CHECK,XQ(G)
  • Actual
    • P(E);N_PINS(f)
    • Threat
      • QAB(G)
    • Vars
      • S(c);N_GUARD,XP(C)::P=Q
      • S(f);SBLOCK,XP(D)::P(B)
      • S(f);OGATE,XB(I)::PXS(f)=Q
      • S(f);N_PINP(E)::PXB(i)=S
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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).