MESON Chess Problem Database

Problem Display
PID: 86929 (8/8/4p1R1/3P1p2/4Bk2/2QP1P1b/5P2/2K5 w - - 0 1)

Tkachenko, Sergiy Ivanovich

Best Problems, 2005

8/8/4p1R1/3P1p2/4Bk2/2QP1P1b/5P2/2K5

#2

8 + 4

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...exd5
      • 2.Qc7#
    • 1...e5
      • 2.Qd2#
  • Tries
    • 1.Rg4+?
      • 1...fxg4
        • 2.Qf6#
      • 1...Bxg4!
    • 1.Qh8?
      • 1...exd5
        • 2.Qb8#
      • 1...Bf1
        • 2.Qh2#
      • 1...Bg2
        • 2.Qh2#
      • 1...Bg4
        • 2.Qh2#
      • 1...e5
        • 2.Qh6#
      • 1...fxe4!
  • Keys
    • 1.Qf6!
      • 1...exd5
        • 2.Qd6#
      • 1...Bf1
        • 2.Rg4#
      • 1...Bg2
        • 2.Rg4#
      • 1...Bg4
        • 2.Rxg4#
      • 1...e5
        • 2.Qg5#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 2
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • P(d);N_GUARD,XP(G)::QAB(C)
    • P(d);SBLOCK::QAB(C)
  • Tries
    • Try
      • R(H);CHECK
      • Vars
        • P(c);S_CUTB(a),XR(H)::QAR2(C)
      • Refutation
        • B(a);XR(H)
    • Try
      • Q(C);
      • Vars
        • P(d);N_GUARD,XP(G)::QAB(C)
        • B(a);OGATE::QAB(C)
        • P(d);SBLOCK::QAB(C)
      • Refutation
        • P(c);XB(F)
  • Actual
    • Q(C);P_PINP(c)
    • Vars
      • P(d);OGATE,XP(G)::QAB(C)
      • B(a);N_GUARD::R1(H)
      • B(a);N_GUARD::R1(H),XB(a)
      • P(d);SBLOCK::QAB1(C)
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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).