MESON Chess Problem Database

Problem Display
PID: 167778 (8/6rB/2N1pbR1/1r6/2P1kqRn/2Q1Np2/p1n5/1b5K w - - 0 1)

Pratt, R

Lancaster Guardian, 1926

8/6rB/2N1pbR1/1r6/2P1kqRn/2Q1Np2/p1n5/1b5K

#2

8 + 11

14868 Pirnie Collection 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Qxg4
      • 2.Rxg4#
    • 1...Bxc3
      • 2.Rxe6#
    • 1...Bd4
      • 2.Rxe6#
    • 1...Bg5
      • 2.Rxe6#
    • 1...Be7
      • 2.Rxe6#
    • 1...Bd8
      • 2.Rxe6#
  • Tries
    • 1.Rxf6+?
      • 1...Rf5
        • 2.Rxe6#
      • 1...Rg6
        • 2.Rgxf4#
        • 2.Rfxf4#
      • 1...Rxh7
        • 2.Rgxf4#
        • 2.Rfxf4#
      • 1...Sg6
        • 2.Rgxf4#
        • 2.Rfxf4#
      • 1...Sf5!
    • 1.Qd4+?
      • 1...Bxd4
        • 2.Rxe6#
      • 1...Sxd4!
  • Keys
    • 1.Sf1!
      • threat
        • 2.Sg3#
      • 1...Kf5
        • 2.R6g5#
      • 1...Qxg4
        • 2.Rxg4#
      • 1...Bxc3
        • 2.Rxe6#
      • 1...Sf5
        • 2.Sd2#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 4
  • Sets
    • Q(f);N_SPINQ(f),OGATE,XR(E)::B(H)+R(G),DCHECK,XQ(f)
    • B(j);OGATE,XQ(B)::B(H)+R(G),DCHECK,XP(i)
    • B(j);OGATE::B(H)+R(G),DCHECK,XP(i)
  • Tries
    • Try
      • R(G);CHECK,XB(j)
      • Vars
        • R(h);P_SPINR(h)::R(G),XP(i)
      • Refutation
        • S(g);P_SPINS(g)
    • Try
      • Q(B);CHECK
      • Vars
        • B(j);OGATE,XQ(B)::B(H)+R(G),DCHECK,XP(i)
      • Refutation
        • S(c);XQ(B)
  • Actual
    • S(C);
    • Threat
      • S(C)
    • Vars
      • K(e);N_SPINQ(f),S_FLIGHT::B(H)+R(G),DCHECK
      • Q(f);N_SPINQ(f),OGATE,XR(E)::B(H)+R(G),DCHECK,XQ(f)
      • B(j);OGATE,XQ(B)::B(H)+R(G),DCHECK,XP(i)
      • S(g);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).