MESON Chess Problem Database

Problem Display
PID: 255791 (3B1R2/3p4/3p2p1/K2Pk2P/3prN2/2np2Nn/8/1b1Q4 w - - 0 1)

Gordian, Yury Markovic

Shanshin, Valery Yurevich

1st HM., Mansfield-125 MT (Kudesnik), 2021

3B1R2/3p4/3p2p1/K2Pk2P/3prN2/2np2Nn/8/1b1Q4

#2

8 + 10

SOLUTION

  • SOUND
  • Sets
    • 1...gxh5
      • 2.Rf5#
    • 1...g5
      • 2.Rf5#
  • Tries
    • 1.Qf3?
      • threat
        • 2.Bf6#
        • 2.Re8#
      • 1...Rxf4
        • 2.Re8#
      • 1...Sxd5
        • 2.Qxe4#
      • 1...Sg5
        • 2.Bf6#
      • 1...Sxf4!
    • 1.Qg4?
      • threat
        • 2.Bf6#
        • 2.Re8#
      • 1...Sxd5
        • 2.Sxg6#
      • 1...Sxf4
        • 2.Qg5#
      • 1...Sg5
        • 2.Bf6#
        • 2.Qxg5#
      • 1...Rxf4!
  • Keys
    • 1.Qb3!
      • threat
        • 2.Sxg6#
      • 1...Rxf4
        • 2.Re8#
      • 1...Sxd5
        • 2.Qxd5#
      • 1...Sxf4
        • 2.Bf6#
      • 1...gxh5
        • 2.Sg6#
        • 2.Rf5#
      • 1...g5
        • 2.Sg6#
        • 2.Rf5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 2
  • Sets
    • P(i);N_GUARD,XP(F)::R1(H)
    • P(i);N_GUARD::R1(H)
  • Tries
    • Try
      • Q(A);
      • Threat
        • DUALS(2)
      • Vars
        • R(f);XS(C)::R(H)
        • S(b);N_GUARD,XP(E)::QAR1(A),XR(f)
        • S(d);::B(G)
      • Refutation
        • S(d);XS(C)
    • Try
      • Q(A);
      • Threat
        • DUALS(2)
      • Vars
        • S(b);SBLOCK,XP(E)::S(C),XP(i)
        • S(d);N_GUARD,XS(C)::QAR2(A)
      • Refutation
        • R(f);XS(C)
  • Actual
    • Q(A);
    • Threat
      • S(C),XP(i)
    • Vars
      • R(f);SBLOCK,XS(C)::R(H)
      • S(b);OGATE,XP(E)::QAR1(A),XS(b)
      • S(d);SBLOCK,XS(C)::B(G)
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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).