MESON Chess Problem Database

Problem Display
PID: 43509 (5nK1/3p1NR1/P1kn3Q/Bp6/PPb2N2/4p3/2Rrq1r1/7B w - - 0 1)

Nietvelt, Gustaaf Josephus

3rd Prize, Pravda Vostoka, 1929

5nK1/3p1NR1/P1kn3Q/Bp6/PPb2N2/4p3/2Rrq1r1/7B

#2

11 + 10

20 De Problemist 1930

SOLUTION

  • SOUND
  • Sets
    • 1...Rxc2
      • 2.Qxd6#
    • 1...Rd5
      • 2.Sd8#
    • 1...Se6
      • 2.Se5#
  • Tries
    • 1.Kxf8?
      • threat
        • 2.Se5#
        • 2.Sd8#
      • 1...Qh5
        • 2.Sd8#
      • 1...Rd5
        • 2.Sd8#
      • 1...bxa4!
    • 1.Rxc4+?
      • 1...bxc4
        • 2.Se5#
        • 2.Sd8#
      • 1...Qxc4!
    • 1.Qe6?
      • threat
        • 2.Se5#
        • 2.Sd8#
      • 1...Sxe6
        • 2.Se5#
      • 1...Qh5
        • 2.Sd8#
      • 1...Rd5
        • 2.Sd8#
        • 2.Qxd5#
      • 1...Sg6
        • 2.Sd8#
      • 1...bxa4!
  • Keys
    • 1.Rg5!
      • threat
        • 2.axb5#
      • 1...Rxc2
        • 2.Qxd6#
      • 1...bxa4
        • 2.b5#
      • 1...Rd5
        • 2.Sd8#
      • 1...Se6
        • 2.Se5#
      • 1...Sg6
        • 2.Rc5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • R(a);N_GUARD,N_SPINB(e),XR(B)::QAR1(H),XS(h)
    • R(a);N_PINS(I),N_SPINR(c)::S(I)
    • S(j);N_PINS(I),N_SPINS(h)::S(I)
  • Tries
    • Try
      • K(K);N_SPINR(J),N_SPINS(I),P-FLIGHT,XS(j)
      • Threat
        • DUALS(2)
      • Vars
        • Q(b);::S(I)
        • R(a);N_SPINR(c)::S(I)
      • Refutation
        • P(f);XP(C)
    • Try
      • R(B);CHECK,N_SPINS(I),XB(e)
      • Refutation
        • Q(b);P_PINS(I),XR(B)
    • Try
      • Q(H);N_SPINS(I)
      • Threat
        • DUALS(2)
      • Vars
        • S(j);N_SPINS(h),XQ(H)::S(I)
        • Q(b);::S(I)
        • S(j);N_PINR(J)::S(I)
      • Refutation
        • P(f);XP(C)
  • Actual
    • R(J);
    • Threat
      • P(C),XP(f)
    • Vars
      • R(a);N_GUARD,N_SPINB(e),XR(B)::QAR1(H),XS(h)
      • P(f);OGATE,XP(C)::P(D)
      • R(a);N_PINS(I),N_SPINR(c)::S(I)
      • S(j);N_PINS(I),N_SPINS(h)::S(I)
      • S(j);N_PINR(J),N_SPINS(h)::R1(J)
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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).