MESON Chess Problem Database

Problem Display
PID: 85844 (8/4p3/4Q3/5p2/5BPp/5K1k/8/8 w - - 0 1)

Speckmann, Werner

L'Alsace, 1965

8/4p3/4Q3/5p2/5BPp/5K1k/8/8

#2

4 + 4

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...fxg4+
      • 2.Qxg4#
  • Tries
    • 1.Be5?
      • 1...fxg4+
        • 2.Qxg4#
      • 1...f4!
    • 1.Bc7?
      • 1...fxg4+
        • 2.Qxg4#
      • 1...f4!
    • 1.Bb8?
      • 1...fxg4+
        • 2.Qxg4#
      • 1...f4!
  • Keys
    • 1.Bg3!
      • 1...fxg4+
        • 2.Qxg4#
      • 1...hxg3
        • 2.Qh6#
      • 1...f4
        • 2.g5#

FEATURES

  • Static
    • TYPE = WAITER
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • P(c);CHECK,OGATE,P_SPINP(c),XP(C)::QAB1(D),XP(c)
  • Tries
    • Try
      • B(B);
      • Vars
        • P(c);CHECK,OGATE,P_SPINP(c),XP(C)::QAB1(D),XP(c)
      • Refutation
        • P(c);
    • Try
      • B(B);
      • Vars
        • P(c);CHECK,OGATE,P_SPINP(c),XP(C)::QAB1(D),XP(c)
      • Refutation
        • P(c);
    • Try
      • B(B);
      • Vars
        • P(c);CHECK,OGATE,P_SPINP(c),XP(C)::QAB1(D),XP(c)
      • Refutation
        • P(c);
  • Actual
    • B(B);
    • Vars
      • P(c);CHECK,OGATE,P_SPINP(c),XP(C)::QAB1(D),XP(c)
      • P(b);OGATEB,XB(B)::QAR(D)
      • P(c);::QAB(D)+P(C)
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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).