MESON Chess Problem Database

Problem Display
PID: 32421 (3N2br/R2N2n1/2pkB2B/1p1q1pQp/2pn4/1p3p1K/2rR4/8 w - - 0 1)

Akerblom, Johan Axel

2nd HM., De Problemist, 1928

3N2br/R2N2n1/2pkB2B/1p1q1pQp/2pn4/1p3p1K/2rR4/8

#2

8 + 14

20 De Problemist 1929
15148 Sadier Collection 2014

SOLUTION

  • SOUND
  • Sets
    • 1...Se8
      • 2.Bf8#
  • Tries
    • 1.Sb7+?
      • 1...Kc7
        • 2.Qd8#
      • 1...Kxe6!
    • 1.Sf7+?
      • 1...Kxe6
        • 2.Sf8#
        • 2.Qf6#
      • 1...Bxf7!
  • Keys
    • 1.Qf6!
      • threat
        • 2.Qf8#
      • 1...Qxe6
        • 2.Rxd4#
      • 1...Bxe6
        • 2.Sf7#
      • 1...Sdxe6
        • 2.Bf4#
      • 1...Sgxe6
        • 2.Bf8#
      • 1...Bf7
        • 2.Sxf7#
      • 1...Bh7
        • 2.Sf7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 6
    • REMOVED MATES = 1
  • Sets
    • S(l);OGATE::B(E)
  • Tries
    • Try
      • S(H);CHECK
      • Vars
        • K(k);S_FLIGHT::QAB1(C)
      • Refutation
        • K(k);P-FLIGHT,XB(D)
    • Try
      • S(H);CHECK
      • Refutation
        • B(m);XS(H)
  • Actual
    • Q(C);
    • Threat
      • QAB(C)
    • Vars
      • Q(g);OGATEB,P_SPINQ(g),P_SPINS(e),XB(D)::R(A),XS(e)
      • B(m);N_GUARD,P_SPINB(m),XB(D)::S(H)
      • S(e);P_SPINQ(g),P_SPINS(e),XB(D)::B(E)
      • S(l);OGATE,P_SPINS(l),XB(D)::B(E)
      • B(m);N_GUARD::S(H),XB(m)
      • B(m);N_GUARD::S(H)
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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).