MESON Chess Problem Database

Problem Display
PID: 202449 (1b5K/6p1/1Q6/3pk1p1/R5P1/5P2/3PP3/8 w - - 0 1)

Benkin, YA

Shakhmaty, 1923

1b5K/6p1/1Q6/3pk1p1/R5P1/5P2/3PP3/8

#2

7 + 5

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Tries
    • 1.Kxg7?
      • threat
        • 2.Qf6#
      • 1...Bd6
        • 2.Qe3#
      • 1...d4!
    • 1.Qc7+?
      • 1...Ke6
        • 2.Ra6#
      • 1...Kf6
        • 2.Ra6#
      • 1...Bxc7!
    • 1.e3?
      • threat
        • 2.d4#
      • 1...d4
        • 2.Ra5#
      • 1...Bd6!
  • Keys
    • 1.Rf4!
      • threat
        • 2.Rf5#
      • 1...Kxf4
        • 2.Qxb8#
      • 1...gxf4
        • 2.d4#
      • 1...Bd6
        • 2.Qe3#
      • 1...g6
        • 2.Qf6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • K(G);S_FLIGHT,XP(d)
      • Threat
        • QAB1(F)
      • Vars
        • B(e);SBLOCK::QAR2(F)
      • Refutation
        • P(a);
    • Try
      • Q(F);CHECK
      • Vars
        • K(b);P-FLIGHT::R(D)
        • K(b);S_FLIGHT::R(D)
      • Refutation
        • B(e);XQ(F)
    • Try
      • P(B);
      • Threat
        • P(A)
      • Vars
        • P(a);OGATEB::R(D)
      • Refutation
        • B(e);
  • Actual
    • R(D);
    • Threat
      • R1(D)
    • Vars
      • K(b);S_FLIGHT,XR(D)::QAB(F),XB(e)
      • P(c);SBLOCK,XR(D)::P(A)
      • B(e);SBLOCK::QAR2(F)
      • P(d);N_GUARD::QAB1(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).