MESON Chess Problem Database

Problem Display
PID: 11902 (R7/3p1kbp/3Pp1p1/2pB3Q/K4Nnr/1pBn4/1p3R2/1b1r4 w - - 0 1)

Albarda, Johannes

1st HM., KeyStip 09. Ty., 1973

R7/3p1kbp/3Pp1p1/2pB3Q/K4Nnr/1pBn4/1p3R2/1b1r4

#2

8 + 14

15148 Sadier Collection 2014

SOLUTION

  • SOUND
  • Sets
    • 1...exd5
      • 2.Qxd5#
    • 1...h6
      • 2.Qxg6#
  • Tries
    • 1.Sxg6+?
      • 1...Sdxf2
        • 2.Sh8#
      • 1...Sf4
        • 2.Sh8#
      • 1...Sgxf2+
        • 2.Sxh4#
      • 1...Sf6+
        • 2.Sxh4#
      • 1...Bf6!
  • Keys
    • 1.Sxe6+!
      • 1...Bf6
        • 2.Rf8#
      • 1...Sdxf2
        • 2.Sg5#
      • 1...Sf4
        • 2.Sg5#
      • 1...Sgxf2+
        • 2.Sf4#
      • 1...Sf6+
        • 2.Sd4#

FEATURES

  • Static
    • TYPE = CHECKING_KEY
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 2
  • Sets
    • P(i);N_SPINP(i),OGATE,P_SPINP(j),XB(E)::QAB(F),XP(i)
    • P(n);N_GUARD::QAB1(F),XP(j)
  • Tries
    • Try
      • S(D);CHECK,XP(j)
      • Vars
        • S(e);XR(A)::QAB(F)+S(D),DCHECK
        • S(e);P_SPINS(e)::QAB(F)+S(D),DCHECK
        • S(f);CHECK,XR(A)::QAB(F)+S(D),XR(g)
        • S(f);CHECK,P_SPINS(f)::QAB(F)+S(D),XR(g)
      • Refutation
        • B(m);P_SPINB(m)
  • Actual
    • S(D);CHECK,P_PINP(j),XP(i)
    • Vars
      • B(m);P_SPINB(m)::R1(H)
      • S(e);XR(A)::B(E)+S(D),DCHECK
      • S(e);P_SPINS(e)::B(E)+S(D),DCHECK
      • S(f);CHECK,XR(A)::B(E)+S(D)
      • S(f);CHECK,P_SPINS(f)::B(E)+S(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).