MESON Chess Problem Database

Problem Display
PID: 113361 (4B3/8/8/1PB4q/kP6/3p3p/1PPQ2n1/5b1K w - - 0 1)

Sobek, Karel

Ruch, 1948

4B3/8/8/1PB4q/kP6/3p3p/1PPQ2n1/5b1K

#2

8 + 6

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Qd1
      • 2.b6#
    • 1...Qh4
      • 2.b6#
    • 1...Qg5
      • 2.b6#
    • 1...dxc2
      • 2.Qxc2#
  • Tries
    • 1.Qc3?
      • threat
        • 2.Qa3#
        • 2.Qb3#
      • 1...dxc2
        • 2.Qxc2#
        • 2.Qa3#
      • 1...Qf7
        • 2.Qa3#
      • 1...Qd5
        • 2.Qa3#
      • 1...Qxe8!
  • Keys
    • 1.Qd1!
      • threat
        • 2.Qa1#
      • 1...Qxd1
        • 2.b6#
      • 1...Qxe8
        • 2.c4#
      • 1...Qxc5
        • 2.c3#
      • 1...dxc2
        • 2.Qxc2#
      • 1...Qf7
        • 2.c4#
      • 1...Qd5
        • 2.c4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 2
  • Sets
    • Q(f);N_GUARD::B(H)+P(F)
    • Q(f);N_GUARD,SBLOCK::B(H)+P(F)
    • P(c);OGATE,XP(C)::QAB(D),XP(c)
  • Tries
    • Try
      • Q(D);
      • Threat
        • DUALS(2)
      • Vars
        • Q(f);::QAR1(D)
      • Refutation
        • Q(f);XB(H)
  • Actual
    • Q(D);
    • Threat
      • QAR(D)
    • Vars
      • Q(f);N_GUARD,XQ(D)::B(H)+P(F)
      • Q(f);N_GUARD,XB(H)::QAB(D)+P(C)
      • Q(f);N_GUARD,XB(G)::QAB(D)+P(C)
      • P(c);OGATE,P_SPINP(c),XP(C)::QAB(D),XP(c)
      • Q(f);N_GUARD::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).