MESON Chess Problem Database

Problem Display
PID: 120740 (4N3/3PkP1p/8/4N3/2P2K2/8/8/1Q6 w - - 0 1)

Strycek, Oskar

Stella Polaris, 1968

4N3/3PkP1p/8/4N3/2P2K2/8/8/1Q6

#2

7 + 2

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Kf8
      • 2.Qb4#
  • Tries
    • 1.Qb4+?
      • 1...Ke6
        • 2.Qd6#
        • 2.d8S#
        • 2.f8S#
      • 1...Kd8!
    • 1.d8Q+?
      • 1...Ke6
        • 2.Sc7#
        • 2.Sg7#
        • 2.Qf5#
        • 2.Qf6#
        • 2.Qbb6#
        • 2.Qd6#
        • 2.Qd7#
        • 2.f8S#
      • 1...Kf8
        • 2.Qb4#
        • 2.Qd6#
      • 1...Kxd8!
    • 1.d8B+?
      • 1...Ke6
        • 2.Qf5#
        • 2.Qb6#
        • 2.f8S#
      • 1...Kf8
        • 2.Qb4#
      • 1...Kxd8!
    • 1.f8Q+?
      • 1...Ke6
        • 2.Sc7#
        • 2.Sg7#
        • 2.Qbf5#
        • 2.Qd6#
        • 2.Qb6#
        • 2.Qf6#
        • 2.Qf7#
        • 2.d8S#
      • 1...Kd8
        • 2.Qb6#
        • 2.Qb8#
        • 2.Qf6#
      • 1...Kxf8!
    • 1.f8B+?
      • 1...Ke6
        • 2.Qf5#
        • 2.Qb6#
        • 2.d8S#
      • 1...Kd8
        • 2.Qb6#
        • 2.Qb8#
      • 1...Kxf8!
  • Keys
    • 1.Qxh7!
      • 1...Ke6
        • 2.f8S#
      • 1...Kd8
        • 2.Qh4#
      • 1...Kf8
        • 2.Sg6#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 1
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • K(a);S_FLIGHT::QAB(A)
  • Tries
    • Try
      • Q(A);CHECK
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • P(E);CHECK
      • Refutation
        • K(a);S_FLIGHT,XQ(E)
    • Try
      • P(E);CHECK
      • Vars
        • K(a);S_FLIGHT::QAB(A)
      • Refutation
        • K(a);S_FLIGHT,XB(E)
    • Try
      • P(F);CHECK
      • Refutation
        • K(a);S_FLIGHT,XQ(F)
    • Try
      • P(F);CHECK
      • Refutation
        • K(a);S_FLIGHT,XB(F)
  • Actual
    • Q(A);XP(b)
    • Vars
      • K(a);P-FLIGHT::P=S
      • K(a);S_FLIGHT::QAB(A)
      • K(a);S_FLIGHT::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).