MESON Chess Problem Database

Problem Display
PID: 176325 (8/5K2/1b1NR3/3k4/3p4/8/b7/2Q5 w - - 0 1)

Petrov, Evgeny Aleksandrovich

Schach-Echo, 1976

8/5K2/1b1NR3/3k4/3p4/8/b7/2Q5

#2

4 + 4

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Bb1
      • 2.Qc4#
    • 1...Bc4
      • 2.Qxc4#
    • 1...Bc5
      • 2.Qh1#
  • Tries
    • 1.Se4?
      • threat
        • 2.Sf6#
        • 2.Qc6#
      • 1...Bc4
        • 2.Qg5#
      • 1...Bc5
        • 2.Sf6#
        • 2.Qxc5#
      • 1...Bd8
        • 2.Qc5#
        • 2.Qc6#
      • 1...d3!
    • 1.Sb7?
      • threat
        • 2.Qc6#
      • 1...Bc4
        • 2.Qg5#
        • 2.Qh1#
      • 1...Bc5
        • 2.Qxc5#
      • 1...d3!
    • 1.Se8?
      • threat
        • 2.Sf6#
        • 2.Qc6#
      • 1...Bc4
        • 2.Qg5#
      • 1...Bc5
        • 2.Sf6#
        • 2.Sc7#
      • 1...Bd8
        • 2.Qc6#
      • 1...d3!
  • Keys
    • 1.Sb5!
      • threat
        • 2.Qc6#
      • 1...Bc4
        • 2.Qg5#
      • 1...Bc5
        • 2.Sc7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 0
    • REMOVED MATES = 1
  • Sets
    • B(a);N_GUARD::QAB1(A)
    • B(a);N_GUARD::QAB1(A),XB(a)
    • B(d);SBLOCK::QAB(A)
  • Tries
    • Try
      • S(B);
      • Threat
        • DUALS(2)
      • Vars
        • B(a);SBLOCK::QAR(A)
      • Refutation
        • P(b);
    • Try
      • S(B);
      • Threat
        • QAB1(A)
      • Vars
        • B(d);N_GUARD::QAR1(A),XB(d)
      • Refutation
        • P(b);
    • Try
      • S(B);
      • Threat
        • DUALS(2)
      • Vars
        • B(a);SBLOCK::QAR(A)
        • B(d);::QAB1(A)
      • Refutation
        • P(b);
  • Actual
    • S(B);
    • Threat
      • QAB1(A)
    • Vars
      • B(a);SBLOCK::QAR(A)
      • B(d);N_GUARD::S(B)
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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).