MESON Chess Problem Database

Problem Display
PID: 82490 (7n/3n2K1/8/4N3/6pk/8/4bPQ1/8 w - - 0 1)

Havel, Miroslav

Narodni osvobozeni, 1946

7n/3n2K1/8/4N3/6pk/8/4bPQ1/8

#2

4 + 5

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Bf1
      • 2.Qxg4#
    • 1...Bd3
      • 2.Qxg4#
    • 1...Bc4
      • 2.Qxg4#
    • 1...Bb5
      • 2.Qxg4#
    • 1...Ba6
      • 2.Qxg4#
  • Tries
    • 1.Kh6?
      • threat
        • 2.Qh1#
        • 2.Qh2#
        • 2.Qg3#
      • 1...Bf1
        • 2.Qg3#
        • 2.Qxg4#
      • 1...Bf3
        • 2.Qh2#
        • 2.Qg3#
      • 1...g3
        • 2.Qh1#
        • 2.Qxg3#
        • 2.fxg3#
      • 1...Sf7+!
  • Keys
    • 1.f4!
      • threat
        • 2.Qh2#
      • 1...Kh5
        • 2.Qh1#
        • 2.Qh2#
      • 1...gxf4 ep
        • 2.Qg4#
      • 1...Bf1
        • 2.Qxg4#
      • 1...g3
        • 2.Qh1#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 4
  • Sets
    • B(a);N_GUARD::QAR1(B),XP(b)
    • B(a);N_GUARD,SBLOCK::QAR1(B),XP(b)
  • Tries
    • Try
      • K(D);S_FLIGHT
      • Threat
        • DUALS(3)
      • Refutation
        • S(e);CHECK
  • Actual
    • P(A);
    • Threat
      • QAR2(B)
    • Vars
      • P(b);EP,S_CUTB(a),XP(A)::QAR1(B)
      • B(a);N_GUARD::QAR1(B),XP(b)
      • P(b);SBLOCK::QAR(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).