MESON Chess Problem Database

Problem Display
PID: 35991 (n4K2/2PQ2N1/1ppBB2b/2P2p1R/3kn2R/3p1r2/1P2P2P/3N4 w - - 0 1)

Nietvelt, Gustaaf Josephus

Recomm., BCF 004. Ty., 1930-1931

n4K2/2PQ2N1/1ppBB2b/2P2p1R/3kn2R/3p1r2/1P2P2P/3N4

#2

13 + 9

SOLUTION

  • SOUND
  • Sets
    • 1...Rf4
      • 2.e3#
    • 1...Bf4
      • 2.Sxf5#
    • 1...Bxg7+
      • 2.Qxg7#
    • 1...bxc5
      • 2.Bg3#
  • Tries
    • 1.Rxe4+?
      • 1...fxe4+
        • 2.Bf4#
      • 1...Kxe4!
    • 1.Qxc6?
      • threat
        • 2.Qa4#
        • 2.Qd5#
      • 1...Sxc7
        • 2.Qa4#
      • 1...dxe2
        • 2.Qd5#
      • 1...bxc5
        • 2.Qd5#
        • 2.Qxc5#
      • 1...Bd2
        • 2.Qd5#
      • 1...b5
        • 2.Qd5#
      • 1...Bxg7+!
  • Keys
    • 1.b4!
      • threat
        • 2.Bg3#
      • 1...Bxg7+
        • 2.Qxg7#
      • 1...Sxc7
        • 2.Bxc7#
      • 1...Rg3
        • 2.Bxg3#
      • 1...Rf4
        • 2.e3#
      • 1...Bf4
        • 2.Sxf5#
      • 1...f4
        • 2.Be5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 1
  • Sets
    • R(b);N_GUARD,N_SPINS(d),S_CUTB(h)::P(C)
    • B(h);N_PINS(L),N_SPINS(d)::S(L),XP(e)
    • B(h);CHECK,OGATE,XS(L)::QAB(K),XB(h)
    • P(f);SBLOCK,XP(F)::QAR(K)+B(H)
  • Tries
    • Try
      • R(E);CHECK,XS(d)
      • Vars
        • P(e);CHECK,SBLOCK,XR(E)::QAR(K)+B(H)
      • Refutation
        • K(c);P-FLIGHT,XR(E)
    • Try
      • Q(K);XP(g)
      • Threat
        • DUALS(2)
      • Vars
        • S(i);XP(J)::QAR(K)
        • P(a);XP(C)::QAR1(K)
        • B(h);N_PINS(L)::QAR1(K)
        • P(f);::QAR1(K)
      • Refutation
        • B(h);CHECK,XS(L)
  • Actual
    • P(B);
    • Threat
      • QAR(K)+B(H)
    • Vars
      • B(h);CHECK,OGATE,XS(L)::QAB(K),XB(h)
      • S(i);OGATE,XP(J)::QAR(K)+B(H),XS(i)
      • R(b);::QAR(K)+B(H),XR(b)
      • R(b);N_GUARD,N_SPINS(d),S_CUTB(h)::P(C)
      • B(h);N_PINS(L),N_SPINS(d)::S(L),XP(e)
      • P(e);N_SPINS(d)::QAR(K)+B(H),DCHECK
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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).