MESON Chess Problem Database

Problem Display
PID: 101228 (b7/1Bn2p1q/1n1Np2B/1pk1N3/4P3/2PQ4/8/1K4b1 w - - 0 1)

Sheldon, Alfred King

Good Companions, 1919

b7/1Bn2p1q/1n1Np2B/1pk1N3/4P3/2PQ4/8/1K4b1

#2

8 + 9

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Qxe4
      • 2.Sxe4#
    • 1...Bh2
      • 2.Be3#
      • 2.Qd4#
    • 1...Be3
      • 2.Bxe3#
    • 1...Bd4
      • 2.Qxd4#
    • 1...Bxb7
      • 2.Sxb7#
    • 1...Sa4
      • 2.Sd7#
    • 1...Sc4
      • 2.Sd7#
    • 1...Sd7
      • 2.Sxd7#
    • 1...Sc8
      • 2.Sd7#
  • Tries
    • 1.Qxb5+?
      • 1...Kxd6
        • 2.Bf8#
      • 1...Sxb5!
  • Keys
    • 1.Qg3!
      • threat
        • 2.Sd3#
      • 1...Qxe4+
        • 2.Sxe4#
      • 1...Kxd6
        • 2.Bf8#
      • 1...Bxb7
        • 2.Sxb7#
      • 1...Sa4
        • 2.Sd7#
      • 1...Sc4
        • 2.Sd7#
      • 1...Sbd5
        • 2.Sd7#
      • 1...Sd7
        • 2.Sxd7#
      • 1...Sc8
        • 2.Sd7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 2
  • Sets
    • Q(h);P_PINQ(C),XP(D)::S(F),XQ(h)
    • B(a);N_GUARD::B(G),XB(a)
    • B(a);N_GUARD::QAB1(C),XB(a)
    • B(i);XB(H)::S(F),XB(i)
    • S(d);N_GUARD::S(E)
    • S(d);N_GUARD::S(E),XS(d)
  • Tries
    • Try
      • Q(C);CHECK,P_SPINP(D),XP(b)
      • Vars
        • K(c);S_FLIGHT,XS(F)::B(G)
      • Refutation
        • S(f);XQ(C)
  • Actual
    • Q(C);P_SPINP(D)
    • Threat
      • S(E)
    • Vars
      • Q(h);CHECK,XP(D)::S(F),XQ(h)
      • K(c);OGATEB,S_FLIGHT,XS(F)::B(G)
      • B(i);XB(H)::S(F),XB(i)
      • S(d);N_GUARD::S(E)
      • S(d);N_GUARD::S(E),XS(d)
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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).