MESON Chess Problem Database

Problem Display
PID: 18651 (Bb6/4Q3/2Np1n1N/1K1Pp1R1/1n2k3/R2p1pP1/2P2P2/8 w - - 0 1)

Ellerman, Arnoldo

Comm., Il Due Mosse, 1957

Bb6/4Q3/2Np1n1N/1K1Pp1R1/1n2k3/R2p1pP1/2P2P2/8

#2

11 + 8

SOLUTION

  • SOUND
  • Sets
    • 1...Sbxd5
      • 2.cxd3#
    • 1...Sfxd5
      • 2.Qh7#
  • Tries
    • 1.Rg4+?
      • 1...Kxd5
        • 2.Sxb4#
        • 2.Qf7#
        • 2.c4#
      • 1...Sxg4!
    • 1.cxd3+?
      • 1...Kxd5
        • 2.Qf7#
      • 1...Sxd3!
  • Keys
    • 1.Sxe5!
      • threat
        • 2.Sc6#
      • 1...Kd4
        • 2.Sxf3#
      • 1...Sbxd5
        • 2.Ra4#
      • 1...Sfxd5
        • 2.Rg4#
      • 1...dxe5
        • 2.Qxb4#
      • 1...Sc6
        • 2.Sxc6#
      • 1...Sg4
        • 2.Rxg4#
      • 1...Sd7
        • 2.Rg4#
      • 1...Sg8
        • 2.Rg4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 6
    • REMOVED MATES = 0
  • Sets
    • S(c);N_GUARD,SBLOCK,XP(F)::P(A),XP(a)
    • S(g);N_GUARD,SBLOCK,XP(F)::QAB(J)
  • Tries
    • Try
      • R(G);CHECK
      • Refutation
        • S(g);XR(G)
    • Try
      • P(A);CHECK,XP(a)
      • Vars
        • K(d);S_FLIGHT,XP(F)::QAB(J)
      • Refutation
        • S(c);XP(A)
  • Actual
    • S(H);XP(e)
    • Threat
      • QAR(J)+S(H)
    • Vars
      • K(d);P-FLIGHT::S(H),XP(b)
      • S(c);OGATEB,P_SPINS(c),XP(F)::R(C)
      • S(g);N_GUARD,P_SPINS(g),XP(F)::R(G)
      • P(f);OGATE,P_SPINP(f),XS(H)::QAR(J),XS(c)
      • S(c);::QAR(J)+S(H),XS(c)
      • S(g);N_GUARD::R(G),XS(g)
      • S(g);N_GUARD::R(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).