MESON Chess Problem Database

Problem Display
PID: 31816 (7b/2np4/Q1n1kpP1/3q1N1R/3PN3/B1P5/B7/4R2K w - - 0 1)

Ellerman, Arnoldo

Bristol Times, 1927

7b/2np4/Q1n1kpP1/3q1N1R/3PN3/B1P5/B7/4R2K

#2

11 + 7

20 De Problemist 1927

SOLUTION

  • SOUND
  • Sets
    • 1...Bg7
      • 2.Sxg7#
    • 1...d6
      • 2.Qc8#
  • Tries
    • 1.Bxd5+?
      • 1...Sxd5
        • 2.Sc5#
      • 1...Kxd5!
    • 1.Qxc6+?
      • 1...d6
        • 2.Qxd6#
      • 1...dxc6!
  • Keys
    • 1.c4!
      • 1...Qxe4+
        • 2.Rxe4#
      • 1...Qxc4
        • 2.Sc3#
      • 1...Qxd4
        • 2.Sc5#
        • 2.Sxd4#
      • 1...Qxf5
        • 2.Sg5#
      • 1...Sxa6
        • 2.cxd5#
      • 1...d6
        • 2.Qc8#
      • 1...Bg7
        • 2.Sxg7#
      • 1...Qa5
        • 2.Sc5#
      • 1...Qb5
        • 2.Sc5#
      • 1...Qc5
        • 2.Sxc5#
      • 1...Qe5
        • 2.Sc5#
      • 1...Qd6
        • 2.Sc5#
      • 1...Sb5
        • 2.cxd5#
      • 1...Sa8
        • 2.cxd5#
      • 1...Se8
        • 2.cxd5#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 12
    • REMOVED MATES = 0
  • Sets
    • B(g);N_GUARD::S(H),XB(g)
    • P(f);N_SPINS(b),OGATEB::QAB(J)
  • Tries
    • Try
      • B(C);CHECK,N_SPINS(G),XQ(a)
      • Vars
        • S(e);SBLOCK,XB(C)::R(A)+S(G),DCHECK
      • Refutation
        • K(c);N_SPINS(b),S_FLIGHT,XB(C)
    • Try
      • Q(J);CHECK,XS(b)
      • Vars
        • P(f);P_SPINP(f)::QAR1(J),XP(f)
      • Refutation
        • P(f);XQ(J)
  • Actual
    • P(E);N_PINQ(a)
    • Vars
      • Q(a);CHECK,OGATE,P_SPINQ(a),XS(G)::R(A),XQ(a)
      • Q(a);N_PINS(G),P_SPINQ(a),XP(E)::R(A)+S(G)
      • Q(a);N_PINS(G),SBLOCK,XS(H)::R(A)+S(G),DCHECK
      • S(e);N_GUARD,N_SPINS(b),XQ(J)::P(E),XQ(a)
      • P(f);N_SPINS(b),OGATEB::QAB(J)
      • B(g);N_GUARD::S(H),XB(g)
      • Q(a);N_PINS(G)::R(A)+S(G),DCHECK
      • Q(a);N_PINS(G)::R(A)+S(G),DCHECK,XQ(a)
      • Q(a);N_PINS(G)::S(G)
      • Q(a);N_PINS(G),N_SPINS(b)::R(A)+S(G),DCHECK
      • S(e);N_GUARD::P(E),XQ(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).