MESON Chess Problem Database

Problem Display
PID: 186185 (8/4QP2/8/1KPP1p2/3k1p2/8/8/b1N1B2B w - - 0 1)

Pribyl, Vaclav

Chess, 1959

8/4QP2/8/1KPP1p2/3k1p2/8/8/b1N1B2B

#2

8 + 4

SOLUTION

  • SOUND
  • Sets
    • 1...Bc3
      • 2.Bf2#
  • Tries
    • 1.Kb4?
      • threat
        • 2.Bf2#
      • 1...Bc3+
        • 2.Bxc3#
      • 1...f3!
    • 1.Bf3?
      • 1...Bc3
        • 2.Bf2#
      • 1...Bb2!
    • 1.Qg5?
      • threat
        • 2.Qxf4#
      • 1...Ke3
        • 2.Qg1#
      • 1...Ke5
        • 2.Qg7#
      • 1...f3!
  • Keys
    • 1.Qh4!
      • threat
        • 2.Qxf4#
      • 1...Ke3
        • 2.Qf2#
      • 1...Ke5
        • 2.Qh8#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 1
  • Sets
    • B(a);SBLOCK::B(B)
  • Tries
    • Try
      • K(D);P-FLIGHT
      • Threat
        • B(B)
      • Vars
        • B(a);CHECK,N_GUARD::B(B),XB(a)
      • Refutation
        • P(c);
    • Try
      • B(C);
      • Vars
        • B(a);SBLOCK::B(B)
      • Refutation
        • B(a);
    • Try
      • Q(G);
      • Threat
        • QAR2(G),XP(c)
      • Vars
        • K(b);P_SPINP(c),S_FLIGHT::QAB(G)
        • K(b);P_SPINP(d),S_FLIGHT::QAB(G)
      • Refutation
        • P(c);
  • Actual
    • Q(G);P_PINP(c)
    • Threat
      • QAR2(G),XP(c)
    • Vars
      • K(b);N_SPINP(c),S_FLIGHT::QAB1(G)
      • K(b);N_SPINP(c),S_FLIGHT::QAB(G)
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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).