MESON Chess Problem Database

Problem Display
PID: 87617 (5R2/2P5/2pN3p/7p/qp1B1nkr/7p/b2N3K/2Q5 w - - 0 1)

Lewis, Robert Tony

The Problemist, 1992

5R2/2P5/2pN3p/7p/qp1B1nkr/7p/b2N3K/2Q5

#2

7 + 10

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Sd3
      • 2.Qg1#
    • 1...Sd5
      • 2.Qg1#
    • 1...Se6
      • 2.Qg1#
    • 1...Sg6
      • 2.Qg1#
  • Tries
    • 1.c8Q+?
      • 1...Kg5
        • 2.Qf5#
      • 1...Se6
        • 2.Qg1#
      • 1...Be6!
  • Keys
    • 1.Sb3!
      • threat
        • 2.Qxf4#
      • 1...Kf3
        • 2.Qd1#
      • 1...Kg5
        • 2.Rg8#
      • 1...Se2
        • 2.c8Q#
        • 2.c8B#
      • 1...Sg2
        • 2.c8Q#
        • 2.c8B#
      • 1...Sd3
        • 2.Qg1#
        • 2.c8Q#
        • 2.c8B#
      • 1...Sd5
        • 2.Qg1#
        • 2.c8Q#
        • 2.c8B#
      • 1...Se6
        • 2.Qg1#
      • 1...Sg6
        • 2.Qg1#
        • 2.c8Q#
        • 2.c8B#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 3
  • Sets
    • S(e);N_GUARD::QAR(A)
  • Tries
    • Try
      • P(F);CHECK
      • Vars
        • K(f);P-FLIGHT::QAR1(F)
        • S(e);P_SPINS(e)::QAR(A)
      • Refutation
        • B(a);P_SPINB(a)
  • Actual
    • S(B);
    • Threat
      • QAR1(A),XS(e)
    • Vars
      • K(f);P_SPINS(e),S_FLIGHT::QAB(A)
      • K(f);P-FLIGHT,P_SPINS(e)::R(G)
      • S(e);N_GUARD::P=Q
      • S(e);N_GUARD::QAR(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).