MESON Chess Problem Database

Problem Display
PID: 172322 (7k/6pp/5P2/8/6K1/2B5/8/2Q5 w - - 0 1)

Andreev, Aleksandr Grigorevich

Vecherni Krasnodar, 1996

7k/6pp/5P2/8/6K1/2B5/8/2Q5

#2

4 + 3

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Sets
    • 1...g5
      • 2.f7#
    • 1...g6
      • 2.f7#
  • Tries
    • 1.Qg5?
      • threat
        • 2.Qxg7#
      • 1...Kg8
        • 2.Qxg7#
      • 1...gxf6
        • 2.Bxf6#
      • 1...g6
        • 2.f7#
      • 1...h5+!
    • 1.f7?
      • threat
        • 2.f8Q#
        • 2.f8R#
      • 1...h6
        • 2.Qxh6#
      • 1...h5+!
  • Keys
    • 1.Qh6!
      • threat
        • 2.Qxg7#
      • 1...Kg8
        • 2.Qxg7#
      • 1...gxf6
        • 2.Qf8#
      • 1...gxh6
        • 2.f7#
      • 1...g5
        • 2.Qg7#
        • 2.Qf8#
        • 2.f7#
      • 1...g6
        • 2.Qg7#
        • 2.Qf8#
        • 2.f7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 2
  • Sets
    • P(a);::B(B)+P(D)
  • Tries
    • Try
      • Q(A);
      • Threat
        • QAB1(A),XP(a)
      • Vars
        • K(c);P-FLIGHT,P_SPINP(a)::QAR1(A),XP(a)
        • P(a);OGATE,P_SPINP(a),XP(D)::B(B),XP(a)
        • P(a);::B(B)+P(D)
      • Refutation
        • P(b);CHECK
    • Try
      • P(D);P_PINP(a)
      • Threat
        • P=Q
      • Vars
        • P(b);OGATEB::QAR2(A),XP(b)
      • Refutation
        • P(b);CHECK
  • Actual
    • Q(A);P_PINP(b)
    • Threat
      • QAB1(A),XP(a)
    • Vars
      • K(c);N_SPINP(b),P-FLIGHT::QAR1(A),XP(a)
      • P(a);N_SPINP(b),OGATE,P_SPINP(a),XP(D)::QAR2(A)
      • P(a);N_SPINP(b),XQ(A)::B(B)+P(D)
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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).