MESON Chess Problem Database

Problem Display
PID: 265559 (8/2Q5/p7/1p6/k7/N1K4B/8/8 w - - 0 1)

Gamma, Alex

Schweizerische Schachzeitung, 2016

8/2Q5/p7/1p6/k7/N1K4B/8/8

#2

4 + 3

SOLUTION

  • SOUND
  • Sets
    • 1...Kxa3
      • 2.Qa5#
  • Tries
    • 1.Bd7?
      • 1...Kxa3
        • 2.Qa5#
      • 1...a5!
    • 1.Qb6?
      • threat
        • 2.Qxa6#
      • 1...b4+
        • 2.Qxb4#
      • 1...Kxa3
        • 2.Qa5#
        • 2.Qxa6#
      • 1...a5!
  • Keys
    • 1.Sxb5!
      • 1...Kxb5
        • 2.Bd7#
      • 1...axb5
        • 2.Qa7#
      • 1...a5
        • 2.Qc4#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 1
  • Sets
    • K(a);N_GUARD,P-FLIGHT,XS(A)::QAR2(D)
  • Tries
    • Try
      • B(C);P_PINP(b)
      • Vars
        • K(a);N_GUARD,N_SPINP(b),P-FLIGHT,XS(A)::QAR2(D)
      • Refutation
        • P(c);
    • Try
      • Q(D);
      • Threat
        • QAR2(D),XP(c)
      • Vars
        • P(b);CHECK,OGATE::QAR1(D),XP(b)
      • Refutation
        • P(c);
  • Actual
    • S(A);XP(b)
    • Vars
      • K(a);OGATEB,S_FLIGHT,XS(A)::B(C)
      • P(c);OGATEB,SBLOCK,XS(A)::QAR(D)
      • P(c);SBLOCK::QAR2(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).