MESON Chess Problem Database

Problem Display
PID: 100888 (qb6/1R3nPb/R2nk2N/1BB3PN/3K2P1/3pp2Q/2r2r1p/8 w - - 0 1)

Davies, Ernest

Good Companions, 1919

qb6/1R3nPb/R2nk2N/1BB3PN/3K2P1/3pp2Q/2r2r1p/8

#2

11 + 11

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Ra2
      • 2.Bc4#
    • 1...Rb2
      • 2.Bc4#
    • 1...Rcd2
      • 2.Bc4#
    • 1...Rce2
      • 2.Bc4#
    • 1...Rc4+
      • 2.Bxc4#
    • 1...Rfd2
      • 2.Sf4#
    • 1...Rfe2
      • 2.Sf4#
    • 1...Rg2
      • 2.Sf4#
    • 1...Rf4+
      • 2.Sxf4#
  • Tries
    • 1.Qxe3+?
      • 1...Se5
        • 2.Qxe5#
      • 1...Be4!
  • Keys
    • 1.g8S!
      • threat
        • 2.Sg7#
        • 2.Bd7#
        • 2.Re7#
      • 1...Rc4+
        • 2.Bxc4#
      • 1...Rf4+
        • 2.Sxf4#
      • 1...Qxb7
        • 2.Sg7#
      • 1...Bxg8
        • 2.Sg7#
      • 1...Sxh6
        • 2.Sg7#
        • 2.Re7#
      • 1...Qa7
        • 2.Sg7#
        • 2.Bd7#
      • 1...Bc7
        • 2.Sg7#
      • 1...Se5
        • 2.Sg7#
        • 2.Re7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 7
  • Sets
    • R(a);N_GUARD::B(D)
    • R(a);CHECK,N_GUARD::B(D),XR(a)
    • R(b);N_GUARD::S(G)
    • R(b);CHECK,N_GUARD::S(G),XR(b)
  • Tries
    • Try
      • Q(A);CHECK,XP(e)
      • Vars
        • S(h);N_GUARD,N_SPINS(f),P_SPINS(h)::QAR1(A),XS(h)
      • Refutation
        • B(i);P_SPINB(i)
  • Actual
    • P(K);
    • Threat
      • DUALS(3)
    • Vars
      • R(a);CHECK,N_GUARD::B(D),XR(a)
      • R(b);CHECK,N_GUARD::S(G),XR(b)
      • Q(j);XR(J)::S(G)
      • B(i);XS(K)::S(G)
      • B(k);::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).