MESON Chess Problem Database

Problem Display
PID: 146508 (QB3K2/1Bp1N3/8/1n1PP2R/Rb1k3P/p1pPp3/4P3/8 w - - 0 1)

Nietvelt, Gustaaf Josephus

2nd Prize, Il Problema, 1931

QB3K2/1Bp1N3/8/1n1PP2R/Rb1k3P/p1pPp3/4P3/8

#2

12 + 7

14868 Pirnie Collection 2013

SOLUTION

  • SOUND
  • Sets
    • 1...c5
      • 2.Sf5#
  • Tries
    • 1.Ba7+?
      • 1...c5
        • 2.Rxb4#
      • 1...Sxa7!
    • 1.Qa7+?
      • 1...c5
        • 2.Sf5#
        • 2.Rxb4#
      • 1...Sxa7!
  • Keys
    • 1.Qa5!
      • threat
        • 2.Qxb4#
      • 1...Kc5
        • 2.Ba7#
      • 1...Sd6
        • 2.Sc6#
      • 1...c5
        • 2.Sf5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • P(g);N_PINS(I),SBLOCK::S(I)
  • Tries
    • Try
      • B(K);CHECK
      • Vars
        • P(g);N_PINS(I),P_SPINP(g)::R(C),XB(d)
      • Refutation
        • S(f);XB(K)
    • Try
      • Q(J);CHECK
      • Refutation
        • S(f);XQ(J)
  • Actual
    • Q(J);
    • Threat
      • QAR2(J),XB(d)
    • Vars
      • K(e);N_PINS(I),N_SPINB(d),P_SPINS(f),S_FLIGHT::B(K)
      • S(f);N_PINS(I)::S(I)
      • P(g);N_PINS(I),SBLOCK::S(I)
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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).