MESON Chess Problem Database

Problem Display
PID: 120058 (4Q3/7p/8/5q2/3pN1p1/4N1B1/p4r2/K2Bk3 w - - 0 1)

Bibrle Josef

Ruch, 1948

4Q3/7p/8/5q2/3pN1p1/4N1B1/p4r2/K2Bk3

#2

6 + 7

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Qe6
      • 2.Bxf2#
    • 1...Qg6
      • 2.Bxf2#
    • 1...Qd7
      • 2.Bxf2#
    • 1...Qc8
      • 2.Bxf2#
    • 1...Qa5
      • 2.Bxf2#
    • 1...Qb5
      • 2.Bxf2#
    • 1...Qc5
      • 2.Bxf2#
    • 1...Qd5
      • 2.Bxf2#
    • 1...Qe5
      • 2.Bxf2#
    • 1...Qg5
      • 2.Bxf2#
    • 1...Qh5
      • 2.Bxf2#
  • Tries
    • 1.Qb5?
      • threat
        • 2.Qf1#
        • 2.Qe2#
        • 2.Qb4#
      • 1...Qxe4
        • 2.Qe2#
        • 2.Qb4#
        • 2.Qa5#
      • 1...Qxb5
        • 2.Bxf2#
      • 1...dxe3
        • 2.Qe2#
      • 1...Qc8
        • 2.Bxf2#
        • 2.Qf1#
        • 2.Qe2#
      • 1...Qf3
        • 2.Qf1#
        • 2.Qb4#
        • 2.Qa5#
      • 1...Qc5
        • 2.Bxf2#
        • 2.Qf1#
        • 2.Qe2#
      • 1...Qf8
        • 2.Qf1#
        • 2.Qe2#
      • 1...d3!
  • Keys
    • 1.Qh5!
      • threat
        • 2.Qh1#
      • 1...Qxe4
        • 2.Qa5#
      • 1...Qxh5
        • 2.Bxf2#
      • 1...Qf3
        • 2.Qa5#
      • 1...Qb5
        • 2.Bxf2#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 9
  • Sets
    • Q(f);N_GUARD::B(D),XR(c)
  • Tries
    • Try
      • Q(F);
      • Threat
        • DUALS(3)
      • Vars
        • Q(f);N_GUARD,XQ(F)::B(D),XR(c)
        • P(d);XS(C)::QAR1(F)
      • Refutation
        • P(d);
  • Actual
    • Q(F);
    • Threat
      • QAR(F)
    • Vars
      • Q(f);OGATE,XS(E)::QAB(F)
      • Q(f);N_GUARD,XQ(F)::B(D),XR(c)
      • Q(f);OGATE::QAB(F)
      • Q(f);N_GUARD::B(D),XR(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).