MESON Chess Problem Database

Problem Display
PID: 175148 (1nB1q3/2Q1p1n1/6N1/1p1k1Np1/8/5P2/K7/8 w - - 0 1)

Okkinga, AS

Tijdschrift vd NSB, 1902

1nB1q3/2Q1p1n1/6N1/1p1k1Np1/8/5P2/K7/8

#2

6 + 7

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Qg8
      • 2.Sgxe7#
    • 1...Qh8
      • 2.Sgxe7#
    • 1...g4
      • 2.Sf4#
  • Tries
    • 1.Qe5+?
      • 1...Kc4
        • 2.Qd4#
      • 1...Kc6!
    • 1.Qd6+?
      • 1...Kc4
        • 2.Qd4#
      • 1...exd6!
  • Keys
    • 1.Qb6!
      • threat
        • 2.Se3#
      • 1...Kc4
        • 2.Qd4#
      • 1...Qxg6
        • 2.Qxb5#
      • 1...Sxf5
        • 2.Be6#
      • 1...Qc6
        • 2.Qd4#
      • 1...Sc6
        • 2.Qxb5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 3
  • Sets
    • Q(g);N_GUARD::S(D),XP(d)
    • P(c);N_GUARD::S(D)
  • Tries
    • Try
      • Q(E);CHECK
      • Vars
        • K(b);S_FLIGHT::QAR1(E)
      • Refutation
        • K(b);S_FLIGHT
    • Try
      • Q(E);CHECK
      • Vars
        • K(b);OGATE,S_FLIGHT::QAR1(E)
      • Refutation
        • P(d);XQ(E)
  • Actual
    • Q(E);
    • Threat
      • S(C)
    • Vars
      • K(b);S_FLIGHT::QAR1(E)
      • Q(g);N_GUARD,XS(D)::QAR2(E),XP(a)
      • S(e);N_GUARD,XS(C)::B(F)
      • Q(g);SBLOCK::QAR1(E)
      • S(f);S_CUTQ(g)::QAR2(E),XP(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).