MESON Chess Problem Database

Problem Display
PID: 225694 (7Q/4p1K1/4P3/3n3b/4N1P1/3N1k2/4R3/3B4 w - - 0 1)

Pituk, Alexander

Praca, 1951

7Q/4p1K1/4P3/3n3b/4N1P1/3N1k2/4R3/3B4

#2

8 + 4

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Bxg4
      • 2.Qh1#
    • 1...Bg6
      • 2.Qh3#
    • 1...Bf7
      • 2.Qh3#
    • 1...Be8
      • 2.Qh3#
    • 1...Sf4
      • 2.Se5#
  • Tries
    • 1.Qxh5?
      • threat
        • 2.Qh3#
        • 2.g5#
      • 1...Sf4
        • 2.Se1#
        • 2.Se5#
      • 1...Sf6
        • 2.Qh3#
        • 2.Qf5#
      • 1...Se3!
    • 1.Qh6?
      • threat
        • 2.Se5#
      • 1...Se3
        • 2.Qf4#
      • 1...Kxg4!
  • Keys
    • 1.Qh7!
      • 1...Kxg4
        • 2.Rh2#
      • 1...Bxg4
        • 2.Qh1#
      • 1...Bg6
        • 2.Qh3#
      • 1...Bf7
        • 2.Qh3#
      • 1...Be8
        • 2.Qh3#
      • 1...Sc3
        • 2.Qf5#
      • 1...Se3
        • 2.Rf2#
      • 1...Sb4
        • 2.Qf5#
      • 1...Sf4
        • 2.Se5#
      • 1...Sb6
        • 2.Qf5#
      • 1...Sf6
        • 2.Qf5#
      • 1...Sc7
        • 2.Qf5#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 7
    • REMOVED MATES = 0
  • Sets
    • B(c);OGATE,SBLOCK,XP(E)::QAB(H)
    • B(c);OGATE::QAR2(H)
    • S(b);SBLOCK::S(C)
  • Tries
    • Try
      • Q(H);XB(c)
      • Threat
        • DUALS(2)
      • Refutation
        • S(b);
    • Try
      • Q(H);
      • Threat
        • S(C)
      • Vars
        • S(b);N_GUARD::QAR1(H)
      • Refutation
        • K(a);S_FLIGHT,XP(E)
  • Actual
    • Q(H);
    • Vars
      • K(a);S_FLIGHT,XP(E)::B(A)+R(B)
      • B(c);OGATE,SBLOCK,XP(E)::QAB(H)
      • B(c);OGATE::QAR2(H)
      • S(b);N_GUARD::QAR2(H)
      • S(b);SBLOCK::B(A)+R(B),DCHECK
      • S(b);SBLOCK::S(C)
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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).