MESON Chess Problem Database

Problem Display
PID: 15781 (8/5Q2/8/4K3/4N1p1/4kB2/8/n7 w - - 0 1)

Saunders, Denis M

The Problemist, 1987

8/5Q2/8/4K3/4N1p1/4kB2/8/n7

#2

4 + 3

2838 Fun with Chess Miniatures 1996
3936 The Wizard of Oz 1999

SOLUTION

  • SOUND
  • Sets
    • 1...Sc2
      • 2.Qb3#
    • 1...Sb3
      • 2.Qxb3#
  • Tries
    • 1.Bd1?
      • 1...Sc2
        • 2.Qb3#
      • 1...Sb3
        • 2.Qxb3#
      • 1...g3
        • 2.Qf3#
      • 1...Kd3!
    • 1.Be2?
      • threat
        • 2.Qf2#
      • 1...g3
        • 2.Qf3#
      • 1...Kxe2!
    • 1.Qa7+?
      • 1...Kxf3
        • 2.Qf2#
      • 1...Kd3!
  • Keys
    • 1.Qa2!
      • threat
        • 2.Qe2#
      • 1...Kd3
        • 2.Qe2#
      • 1...Kxf3
        • 2.Qf2#
      • 1...gxf3
        • 2.Qd2#
      • 1...Sc2
        • 2.Qb3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 1
  • Sets
    • S(a);N_GUARD::QAR(D)
    • S(a);N_GUARD::QAR(D),XS(a)
  • Tries
    • Try
      • B(A);
      • Vars
        • S(a);N_GUARD::QAR(D)
        • S(a);N_GUARD::QAR(D),XS(a)
        • P(c);N_GUARD::QAR1(D)
      • Refutation
        • K(b);P-FLIGHT
    • Try
      • B(A);
      • Threat
        • QAB1(D)
      • Vars
        • P(c);N_GUARD::QAR1(D)
      • Refutation
        • K(b);P-FLIGHT,XB(A)
    • Try
      • Q(D);CHECK
      • Vars
        • K(b);OGATE,P-FLIGHT,XB(A)::QAR1(D)
      • Refutation
        • K(b);P-FLIGHT
  • Actual
    • Q(D);
    • Threat
      • QAR1(D)
    • Vars
      • K(b);P-FLIGHT::QAB1(D)
      • K(b);P-FLIGHT,XB(A)::QAR1(D)
      • P(c);SBLOCK,XB(A)::QAB1(D)
      • S(a);N_GUARD::QAR(D)
HTML5 logo

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).