MESON Chess Problem Database

Problem Display
PID: 21874 (1B6/8/1Q1rR1B1/1P2Nn2/1KP1k3/1p1r1p1P/5P2/8 w - - 0 1)

Goethart, Gerhardus Hendrik

Oprechte Haarlemsche Courant, 1921

1B6/8/1Q1rR1B1/1P2Nn2/1KP1k3/1p1r1p1P/5P2/8

#2

10 + 6

SOLUTION

  • SOUND
  • Sets
    • 1...Rd1
      • 2.Qe3#
    • 1...Rd2
      • 2.Qe3#
    • 1...Re3
      • 2.Qxe3#
    • 1...R3d5
      • 2.Qe3#
    • 1...Rd4
      • 2.Sg4#
      • 2.Sc6#
      • 2.Sd7#
      • 2.Sf7#
    • 1...Rxb6
      • 2.Sc6#
    • 1...Rc6
      • 2.Sxc6#
    • 1...Rd7
      • 2.Sg4#
      • 2.Sc6#
      • 2.Sxd7#
      • 2.Sf7#
    • 1...Rd8
      • 2.Sg4#
      • 2.Sc6#
      • 2.Sd7#
      • 2.Sf7#
  • Tries
    • 1.Sxd3+?
      • 1...Rxe6
        • 2.Qe3#
      • 1...Kxd3!
    • 1.Sf7+?
      • 1...Rxe6
        • 2.Sg5#
      • 1...Kf4!
  • Keys
    • 1.Qd8!
      • threat
        • 2.Qh4#
      • 1...Kd4
        • 2.Sc6#
      • 1...Kf4
        • 2.Sxd3#
      • 1...Rxd8
        • 2.Sc6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 6
  • Sets
    • R(b);N_GUARD::QAR1(G)
    • R(b);N_GUARD::QAR1(G),XR(b)
    • R(f);N_GUARD,P_PINP(E),XQ(G)::R(H)+S(F)
    • R(f);N_GUARD::R(H)+S(F),XR(f)
  • Tries
    • Try
      • S(F);CHECK,XR(b)
      • Vars
        • R(f);XR(H)::QAR1(G)
      • Refutation
        • K(d);S_FLIGHT,XS(F)
    • Try
      • S(F);CHECK
      • Vars
        • R(f);XR(H)::S(F)
      • Refutation
        • K(d);N_SPINS(e),P-FLIGHT,P_SPINR(f)
  • Actual
    • Q(G);
    • Threat
      • QAR(G)
    • Vars
      • K(d);N_SPINS(e),P-FLIGHT,P_SPINR(f)::S(F)
      • K(d);N_SPINS(e),P-FLIGHT::S(F),XR(b)
      • R(f);N_GUARD,XQ(G)::R(H)+S(F)
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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).