MESON Chess Problem Database

Problem Display
PID: 78623 (1B3K2/3p1pNN/n5r1/2R3p1/Qb4k1/1p3RP1/2b2PP1/8 w - - 0 1)

Nietvelt, Gustaaf Josephus

2nd Prize, DBP, 1943

1B3K2/3p1pNN/n5r1/2R3p1/Qb4k1/1p3RP1/2b2PP1/8

#2

10 + 9

SOLUTION

  • SOUND
  • Sets
    • 1...Rd6
      • 2.Rxg5#
    • 1...Rf6
      • 2.Sxf6#
    • 1...Rxg7
      • 2.Sf6#
  • Tries
    • 1.Qxd7+?
      • 1...Re6
        • 2.Sf6#
      • 1...Bf5
        • 2.Qxf5#
      • 1...f5!
    • 1.Qxb4+?
      • 1...Be4
        • 2.Qxe4#
      • 1...Sxb4!
  • Keys
    • 1.Rd3!
      • threat
        • 2.f3#
      • 1...Rxg7
        • 2.Sf6#
      • 1...Sxb8
        • 2.Qxb4#
      • 1...Rd6
        • 2.Rxg5#
      • 1...Rf6
        • 2.Sxf6#
      • 1...Bd1
        • 2.Rd4#
      • 1...Sc7
        • 2.Qxb4#
      • 1...d6
        • 2.Rc4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
    • R(g);N_PINR(F)::R1(F),XP(e)
    • R(g);N_GUARD::S(H),XR(g)
    • R(g);N_GUARD,XS(G)::S(H)
  • Tries
    • Try
      • Q(E);CHECK,N_PINB(c),XP(h)
      • Vars
        • R(g);P_SPINR(g)::S(H)
        • B(a);N_GUARD,P_SPINB(a)::QAB1(E),XB(a)
      • Refutation
        • P(i);P_SPINP(i)
    • Try
      • Q(E);CHECK,N_SPINR(F),XB(c)
      • Vars
        • B(a);N_GUARD,P_SPINB(a)::QAR2(E),XB(a)
      • Refutation
        • S(f);XQ(E)
  • Actual
    • R(C);
    • Threat
      • P(A)
    • Vars
      • R(g);N_GUARD,XS(G)::S(H)
      • S(f);N_GUARD,XB(I)::QAR(E),XB(c)
      • R(g);N_PINR(F)::R1(F),XP(e)
      • R(g);N_GUARD::S(H),XR(g)
      • B(a);N_GUARD::R(C)
      • S(f);N_GUARD::QAR(E),XB(c)
      • P(h);N_PINR(F)::R(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).