MESON Chess Problem Database

Problem Display
PID: 74891 (2R5/8/4k3/2B3pK/p4pN1/p2N4/P1Q5/8 w - - 0 1)

Golha, Jan

Pravda, 1975

2R5/8/4k3/2B3pK/p4pN1/p2N4/P1Q5/8

#2

7 + 5

SOLUTION

  • SOUND
  • Tries
    • 1.Sdf2?
      • 1...Kd5
        • 2.Qe4#
      • 1...Kd7
        • 2.Qf5#
      • 1...Kf7
        • 2.Qg6#
      • 1...f3!
    • 1.Sb4?
      • 1...Kd7
        • 2.Qf5#
      • 1...Kf7
        • 2.Qg6#
      • 1...f3!
    • 1.Sxf4+?
      • 1...Kd7
        • 2.Qf5#
      • 1...Kf7
        • 2.Qg6#
        • 2.Qh7#
      • 1...gxf4!
    • 1.Sde5?
      • 1...Kd5
        • 2.Qc4#
      • 1...f3!
    • 1.Bf8?
      • 1...Kd5
        • 2.Qc4#
      • 1...Kf5
        • 2.Sc5#
      • 1...Kd7
        • 2.Qc6#
      • 1...Kf7
        • 2.Qc4#
      • 1...f3!
    • 1.Qc4+?
      • 1...Kf5
        • 2.Rf8#
        • 2.Qd5#
      • 1...Kd7!
  • Keys
    • 1.Qe2+!
      • 1...Kd5
        • 2.Sb4#
      • 1...Kf5
        • 2.Rf8#
        • 2.Qe5#
      • 1...Kd7
        • 2.Qe8#
      • 1...Kf7
        • 2.Qe7#

FEATURES

  • Static
    • TYPE = CHECKING_KEY
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • S(C);
      • Vars
        • K(e);S_FLIGHT::QAB1(B)
        • K(e);S_FLIGHT::QAB(B)
      • Refutation
        • P(c);
    • Try
      • S(C);
      • Vars
        • K(e);S_FLIGHT::QAB(B)
        • K(e);S_FLIGHT::QAB1(B)
      • Refutation
        • P(c);
    • Try
      • S(C);CHECK,XP(c)
      • Vars
        • K(e);S_FLIGHT::QAB(B)
      • Refutation
        • P(d);XS(C)
    • Try
      • S(C);
      • Vars
        • K(e);S_FLIGHT::QAB1(B)
      • Refutation
        • P(c);
    • Try
      • B(E);
      • Vars
        • K(e);S_FLIGHT::QAB1(B)
        • K(e);S_FLIGHT::QAB(B)+S(C)
        • K(e);S_FLIGHT::QAB(B)
      • Refutation
        • P(c);
    • Try
      • Q(B);CHECK
      • Refutation
        • K(e);S_FLIGHT
  • Actual
    • Q(B);CHECK
    • Vars
      • K(e);S_FLIGHT::S(C)
      • K(e);OGATE,S_FLIGHT::QAB1(B)
      • K(e);OGATE,S_FLIGHT::QAR1(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).