MESON Chess Problem Database

Problem Display
PID: 10751 (2b2B2/1p2p1r1/3p3R/pPNk4/3p1PN1/3p1P1K/6B1/2Q5 w - - 0 1)

Valois, Paul Stedman

The Problemist, 1967

2b2B2/1p2p1r1/3p3R/pPNk4/3p1PN1/3p1P1K/6B1/2Q5

#2

10 + 9

SOLUTION

  • SOUND
  • Sets
    • 1...Rxg4
      • 2.fxg4#
    • 1...Bxg4+
      • 2.fxg4#
    • 1...e5
      • 2.Rxd6#
    • 1...e6
      • 2.Sf6#
  • Tries
    • 1.Sa4?
      • threat
        • 2.Sb6#
      • 1...Bxg4+
        • 2.fxg4#
      • 1...b6
        • 2.Sxb6#
        • 2.Qc6#
      • 1...Rg6!
  • Keys
    • 1.Sa6!
      • threat
        • 2.Sc7#
      • 1...Bxg4+
        • 2.fxg4#
      • 1...bxa6
        • 2.Qc6#
      • 1...e5
        • 2.Rxd6#
      • 1...e6
        • 2.Sf6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 1
  • Sets
    • R(h);OGATE,XS(F)::B(B)+P(C),XR(h)
    • B(i);CHECK,OGATE,XS(F)::B(B)+P(C),XB(i)
    • P(g);N_GUARD::R1(I),XP(e)
    • P(g);N_PINS(F)::S(F)
  • Tries
    • Try
      • S(H);
      • Threat
        • S(H)
      • Vars
        • B(i);CHECK,OGATE,XS(F)::B(B)+P(C),XB(i)
      • Refutation
        • R(h);
  • Actual
    • S(H);
    • Threat
      • S(H)
    • Vars
      • B(i);CHECK,OGATE,XS(F)::B(B)+P(C),XB(i)
      • P(f);N_GUARD,XS(H)::QAB1(A)
      • P(g);N_GUARD::R1(I),XP(e)
      • P(g);N_PINS(F),SBLOCK::S(F)
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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).