MESON Chess Problem Database

Problem Display
PID: 171031 (3n4/3Pk1pK/1N2P1B1/2P3P1/8/8/8/Q7 w - - 0 1)

Mihalco, Oto

Variantim, 1990

3n4/3Pk1pK/1N2P1B1/2P3P1/8/8/8/Q7

#2

8 + 3

SOLUTION

  • SOUND
  • Sets
    • 1...Kxe6
      • 2.Qe1#
    • 1...Kf8
      • 2.Qxg7#
  • Tries
    • 1.Kxg7?
      • threat
        • 2.Qf6#
      • 1...Kxe6
        • 2.Qf6#
        • 2.Qe1#
      • 1...Sxe6+!
    • 1.Sd5+?
      • 1...Kf8
        • 2.Qxg7#
        • 2.e7#
      • 1...Kxe6!
    • 1.Sc8+?
      • 1...Kf8
        • 2.Qxg7#
        • 2.e7#
      • 1...Kxe6!
    • 1.Qxg7+?
      • 1...Kxe6
        • 2.Qf6#
      • 1...Sf7!
  • Keys
    • 1.Qa8!
      • 1...Kxe6
        • 2.Qe4#
      • 1...Kf8
        • 2.Qxd8#
      • 1...Sxe6
        • 2.Qe8#
      • 1...Sc6
        • 2.Qe8#
      • 1...Sb7
        • 2.Qe8#
      • 1...Sf7
        • 2.Qe8#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 2
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
    • K(a);OGATEB,P-FLIGHT,XP(E)::QAR(A)
    • K(a);S_FLIGHT::QAB1(A),XP(b)
  • Tries
    • Try
      • K(H);P-FLIGHT,XP(b)
      • Threat
        • QAB1(A)
      • Refutation
        • S(c);CHECK,XP(E)
    • Try
      • S(D);CHECK
      • Refutation
        • K(a);P-FLIGHT,XP(E)
    • Try
      • S(D);CHECK
      • Refutation
        • K(a);P-FLIGHT,XP(E)
    • Try
      • Q(A);CHECK,XP(b)
      • Vars
        • K(a);P-FLIGHT,XP(E)::QAR1(A)
      • Refutation
        • S(c);P_SPINS(c)
  • Actual
    • Q(A);
    • Vars
      • K(a);OGATEB,P-FLIGHT,XP(E)::QAR2(A)
      • K(a);P_SPINS(c),S_FLIGHT::QAR2(A),XS(c)
      • S(c);OGATE,SBLOCK,XP(E)::QAR1(A)
      • S(c);OGATE::QAR1(A)
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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).