MESON Chess Problem Database

Problem Display
PID: 202962 (n6q/1PPk2BN/1P3p2/2K2P2/1N4n1/8/8/4R3 w - - 0 1)

Jankevics, Karlis

Sachova skladba, 2013

n6q/1PPk2BN/1P3p2/2K2P2/1N4n1/8/8/4R3

#2

9 + 5

SOLUTION

  • SOUND
  • Sets
    • 1...Qxg7
      • 2.c8Q#
    • 1...Qxh7
      • 2.c8Q#
    • 1...Qf8+
      • 2.Sxf8#
    • 1...Sf2
      • 2.Sxf6#
    • 1...Sh2
      • 2.Sxf6#
    • 1...Sh6
      • 2.Sxf6#
  • Tries
    • 1.Bf8?
      • threat
        • 2.Re7#
        • 2.c8Q#
      • 1...Qxf8+
        • 2.Sxf8#
      • 1...Qxh7
        • 2.c8Q#
      • 1...Sxb6
        • 2.Re7#
      • 1...Se3
        • 2.c8Q#
      • 1...Se5
        • 2.c8Q#
      • 1...Qg7
        • 2.c8Q#
      • 1...Sxc7!
    • 1.c8B+?
      • 1...Kd8
        • 2.Sc6#
      • 1...Qxc8+!
  • Keys
    • 1.Sc6!
      • threat
        • 2.Re7#
      • 1...Qf8+
        • 2.Sxf8#
      • 1...Qxg7
        • 2.Sb8#
        • 2.c8Q#
        • 2.c8B#
      • 1...Se3
        • 2.Sxf6#
      • 1...Se5
        • 2.Sxf6#
      • 1...Qd8
        • 2.cxd8Q#
        • 2.cxd8R#
      • 1...Qe8
        • 2.Rd1#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 5
  • Sets
    • Q(e);N_GUARD,XB(H)::P=Q
    • Q(e);N_GUARD,XS(I)::P=Q
    • Q(e);CHECK,N_GUARD::S(I),XQ(e)
    • S(a);N_GUARD::S(I),XP(b)
  • Tries
    • Try
      • B(H);
      • Threat
        • DUALS(2)
      • Vars
        • Q(e);CHECK,XB(H)::S(I),XQ(e)
        • Q(e);XS(I)::P=Q
        • S(d);XP(E)::R1(A)
        • S(a);::P=Q
        • Q(e);::P=Q
      • Refutation
        • S(d);XP(G)
    • Try
      • P(G);CHECK
      • Vars
        • K(c);P-FLIGHT::S(B)
      • Refutation
        • Q(e);CHECK,XB(G)
  • Actual
    • S(B);
    • Threat
      • R1(A)
    • Vars
      • Q(e);CHECK,N_GUARD::S(I),XQ(e)
      • S(a);N_GUARD::S(I),XP(b)
      • Q(e);OGATE::PXQ(e)=Q
      • Q(e);SBLOCK::R(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).