MESON Chess Problem Database

Problem Display
PID: 46964 (8/8/7K/8/5pk1/3B2PR/8/1Q6 w - - 0 1)

Iwanow, Eugeniusz

Indian Chess Bulletin, 1958

8/8/7K/8/5pk1/3B2PR/8/1Q6

#2

5 + 2

4883 Still More Fun with Chess Miniatures 2002
5454 Near Snap 2011
56 The Problemist 2012

SOLUTION

  • SOUND
  • Sets
    • 1...f3
      • 2.Bf5#
  • Tries
    • 1.Bf1?
      • 1...fxg3
        • 2.Qe4#
      • 1...f3
        • 2.Qe4#
        • 2.Qg6#
      • 1...Kf3!
    • 1.Qe1?
      • 1...Kf3
        • 2.Qe2#
      • 1...fxg3
        • 2.Qxg3#
      • 1...f3
        • 2.Rh4#
        • 2.Qe6#
      • 1...Kxh3!
    • 1.Qf1?
      • 1...fxg3
        • 2.Be2#
        • 2.Bf5#
        • 2.Qf5#
      • 1...f3!
    • 1.Qh1?
      • 1...fxg3
        • 2.Rh4#
      • 1...f3!
  • Keys
    • 1.Qg1!
      • 1...Kf3
        • 2.g4#
      • 1...Kxh3
        • 2.Bf5#
      • 1...fxg3
        • 2.Qxg3#
      • 1...f3
        • 2.Rh4#

Anticipated by 223370(1885)

This anticipates 140171(1975)

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 1
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • P(a);SBLOCK::B(B)
  • Tries
    • Try
      • B(B);
      • Vars
        • P(a);OGATEB,XP(C)::QAR2(A)
      • Refutation
        • K(b);S_FLIGHT
    • Try
      • Q(A);
      • Vars
        • K(b);S_FLIGHT::QAB1(A)
        • P(a);OGATE,XP(C)::QAR1(A),XP(a)
      • Refutation
        • K(b);S_FLIGHT,XR(D)
    • Try
      • Q(A);
      • Refutation
        • P(a);
    • Try
      • Q(A);
      • Vars
        • P(a);SBLOCK,XP(C)::R1(D)
      • Refutation
        • P(a);
  • Actual
    • Q(A);
    • Vars
      • K(b);OGATE,S_FLIGHT::R(D)+P(C)
      • K(b);S_FLIGHT,XR(D)::B(B)
      • P(a);OGATE,P_SPINP(a),XP(C)::QAR1(A),XP(a)
      • P(a);SBLOCK::R1(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).