MESON Chess Problem Database

Problem Display
PID: 274964 (4Q1bb/4p2r/2R3p1/7p/2B5/4B2p/3P3p/R3K2k w Q - 0 1)

Dawson, Thomas Rayner

The Problemist, 1933

4Q1bb/4p2r/2R3p1/7p/2B5/4B2p/3P3p/R3K2k

#2

7 + 9

SOLUTION

  • SOUND
  • Sets
    • 1...Rg7
      • 2.Kf2#
    • 1...Bd5
      • 2.Bxd5#
    • 1...e5
      • 2.Kf2#
  • Tries
    • 1.Ke2+?
      • 1...Kg2
        • 2.Rxg6#
        • 2.Qxg6#
      • 1...Bxa1!
    • 1.Qxg6?
      • threat
        • 2.Qe4#
        • 2.0-0-0#
      • 1...Bxc4
        • 2.Qe4#
      • 1...Bxa1
        • 2.Qe4#
      • 1...Rg7
        • 2.Ke2#
        • 2.Kf2#
        • 2.0-0-0#
      • 1...Bd5
        • 2.Bxd5#
        • 2.0-0-0#
      • 1...Bb2
        • 2.Qe4#
      • 1...Rf7!
  • Keys
    • 1.Qa8!
      • threat
        • 2.Re6#
      • 1...Kg2
        • 2.Rxg6#
      • 1...Bxc4
        • 2.Rxc4#
      • 1...Rf7
        • 2.Rf6#
      • 1...Bd5
        • 2.Bxd5#
      • 1...Be6
        • 2.Rxe6#
      • 1...e5
        • 2.Kf2#
      • 1...e6
        • 2.Rc7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 1
  • Sets
    • R(g);S_CUTB(i)::R(A)+K(B)
    • B(h);N_GUARD::B(E),XB(h)
    • P(f);S_CUTB(i)::R(A)+K(B)
  • Tries
    • Try
      • K(B);CHECK,P-FLIGHT
      • Refutation
        • B(i);XR(A)
    • Try
      • Q(G);XP(e)
      • Threat
        • DUALS(2)
      • Vars
        • B(h);XB(E)::QAB(G)
        • B(i);SBLOCK,XR(A)::QAB(G)
        • B(i);::QAB(G)
      • Refutation
        • R(g);
  • Actual
    • Q(G);
    • Threat
      • QAB(G)+R(F)
    • Vars
      • K(a);S_FLIGHT::QAB(G)+R(F),DCHECK,XP(e)
      • B(h);OGATE,XB(E)::QAB(G)+R(F),XB(h)
      • R(g);S_CUTB(h)::QAB(G)+R(F)
      • B(h);N_GUARD::B(E),XB(h)
      • B(h);::QAB(G)+R(F),XB(h)
      • P(f);S_CUTB(i)::R(A)+K(B)
      • P(f);S_CUTB(h)::QAB(G)+R(F)
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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).