MESON Chess Problem Database

Problem Display
PID: 51021 (3B1KB1/1p6/3p2pp/3Nk3/1Q2n1P1/2P1b2P/4P2P/8 w - - 0 1)

McKean, JS

Wharfedale and Airedale Observer, 1889

3B1KB1/1p6/3p2pp/3Nk3/1Q2n1P1/2P1b2P/4P2P/8

#2

10 + 7

SOLUTION

  • SOUND
  • Sets
    • 1...Bc1
      • 2.Qd4#
    • 1...Bd2
      • 2.Qd4#
    • 1...Bd4
      • 2.Qxd4#
      • 2.cxd4#
    • 1...Bf4
      • 2.Qd4#
    • 1...Bg5
      • 2.Qd4#
    • 1...Sd2
      • 2.Bf6#
    • 1...Sf2
      • 2.Bf6#
    • 1...Sxc3
      • 2.Bf6#
    • 1...Sg3
      • 2.Bf6#
    • 1...Sc5
      • 2.Bf6#
    • 1...Sg5
      • 2.Bf6#
    • 1...Sf6
      • 2.Bxf6#
  • Tries
    • 1.Sf4?
      • threat
        • 2.Sd3#
        • 2.Sxg6#
      • 1...Bxf4
        • 2.Qd4#
      • 1...Sf2
        • 2.Sxg6#
      • 1...Sc5
        • 2.Sxg6#
      • 1...g5
        • 2.Sd3#
        • 2.Sg6#
      • 1...Kxf4!
    • 1.Qa4?
      • threat
        • 2.Qe8#
      • 1...Sxc3
        • 2.Bf6#
      • 1...Bg5
        • 2.Qd4#
      • 1...Sc5
        • 2.Bf6#
      • 1...Sg5
        • 2.Bf6#
      • 1...Sf6
        • 2.Bxf6#
      • 1...b5!
  • Keys
    • 1.Se7!
      • threat
        • 2.Sxg6#
      • 1...Kf4
        • 2.Sxg6#
      • 1...Kf6
        • 2.Sc6#
      • 1...g5
        • 2.Sg6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 11
  • Sets
    • B(a);N_GUARD::QAB1(E)
    • S(b);N_GUARD::B(H)
    • S(b);N_GUARD,XP(C)::B(H)
    • S(b);N_GUARD::B(H),XS(b)
  • Tries
    • Try
      • S(G);
      • Threat
        • DUALS(2)
      • Vars
        • B(a);N_GUARD,SBLOCK,XS(G)::QAB1(E)
        • S(b);::S(G),XP(e)
      • Refutation
        • K(c);P_SPINS(b),S_FLIGHT,XS(G)
    • Try
      • Q(E);
      • Threat
        • QAR(E)
      • Vars
        • S(b);N_GUARD,XP(C)::B(H)
        • B(a);N_GUARD::QAB1(E)
        • S(b);N_GUARD::B(H)
        • S(b);N_GUARD::B(H),XS(b)
      • Refutation
        • P(g);
  • Actual
    • S(G);
    • Threat
      • S(G),XP(e)
    • Vars
      • K(c);P_SPINS(b),S_FLIGHT::S(G),XP(e)
      • K(c);S_FLIGHT::B(H)+S(G)
      • P(e);::S(G)
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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).