MESON Chess Problem Database

Problem Display
PID: 17686 (2n5/1p6/k7/1N6/NK6/8/8/Q7 w - - 0 1)

Macs, Valdemar

3rd HM., Molodikh Avtorov, 1948

2n5/1p6/k7/1N6/NK6/8/8/Q7

#2

4 + 3

113 Shakhmaty v SSSR 1949
3295 Einfuhrung in die Welt des Schachproblem 1984
3296 Shakhmatny zadachi miniaturi 1987
3813 300 Sachmatu Uzdaviniu 1991
3713 Snap 2007

SOLUTION

  • SOUND
  • Sets
    • 1...Sb6
      • 2.Sc5#
    • 1...Sa7
      • 2.Sc7#
    • 1...b6
      • 2.Sc5#
  • Tries
    • 1.Kc5?
      • threat
        • 2.Sb2#
        • 2.Sac3#
        • 2.Sb6#
      • 1...Ka5
        • 2.Sb2#
        • 2.Sac3#
        • 2.Sb6#
      • 1...Sb6
        • 2.Sxb6#
      • 1...b6+!
    • 1.Qd4?
      • threat
        • 2.Sc7#
      • 1...Sb6
        • 2.Sc5#
        • 2.Qxb6#
      • 1...b6!
    • 1.Qf6+?
      • 1...Sb6
        • 2.Sc5#
        • 2.Qxb6#
      • 1...b6
        • 2.Sc5#
      • 1...Sd6!
    • 1.Qg1?
      • threat
        • 2.Sc7#
      • 1...Sb6
        • 2.Sc5#
        • 2.Qxb6#
      • 1...b6!
  • Keys
    • 1.Qh8!
      • 1...b6
        • 2.Qxc8#
      • 1...Sd6
        • 2.Qa8#
      • 1...Sb6
        • 2.Sc5#
      • 1...Sa7
        • 2.Sc7#
      • 1...Se7
        • 2.Qa8#

This anticipates 33182(1952)

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 1
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • S(c);SBLOCK::QAR(A)+S(B),DCHECK
    • S(c);SBLOCK::S(D)
    • P(b);SBLOCK::QAR(A)+S(B),DCHECK
  • Tries
    • Try
      • K(C);S_FLIGHT
      • Threat
        • DUALS(3)
      • Vars
        • S(c);::QAR(A)+S(B),XS(c)
      • Refutation
        • P(b);CHECK
    • Try
      • Q(A);
      • Threat
        • S(D)
      • Refutation
        • P(b);
    • Try
      • Q(A);CHECK
      • Vars
        • P(b);P_SPINP(b)::S(B)
      • Refutation
        • S(c);P_SPINS(c)
    • Try
      • Q(A);
      • Threat
        • S(D)
      • Refutation
        • P(b);
  • Actual
    • Q(A);
    • Vars
      • P(b);OGATEB::QAB(A),XS(c)
      • S(c);OGATE::QAR2(A)
      • S(c);SBLOCK::S(B)
      • S(c);SBLOCK::S(D)
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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).