MESON Chess Problem Database

Problem Display
PID: 263846 (1K3N1q/p6p/3QB2p/3RP3/RB1b1k1P/4r3/1p1rPN1P/8 w - - 0 1)

Nietvelt, Gustaaf Josephus

Tijdschrift vd NSB, 1929

1K3N1q/p6p/3QB2p/3RP3/RB1b1k1P/4r3/1p1rPN1P/8

#2

12 + 9

6490 yacpdb 2022

SOLUTION

  • SOUND
  • Sets
    • 1...Qxf8+
      • 2.Qxf8#
    • 1...Rxe5
      • 2.Bxd2#
    • 1...Bxe5
      • 2.Bxd2#
  • Tries
    • 1.Rxd4+?
      • 1...Re4
        • 2.Bxd2#
        • 2.Rxe4#
      • 1...Rxd4!
  • Keys
    • 1.Bg4!
      • threat
        • 2.Qxh6#
      • 1...Qxf8+
        • 2.Qxf8#
      • 1...Qxe5
        • 2.Se6#
      • 1...Rxe5
        • 2.Bxd2#
      • 1...Bxe5
        • 2.Bxd2#
      • 1...Qf6
        • 2.Qxf6#
      • 1...Qg7
        • 2.Se6#
      • 1...Qg8
        • 2.Qf6#
      • 1...h5
        • 2.Qh6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 0
  • Sets
    • Q(i);CHECK,OGATE,XS(L)::QAR(I),XQ(i)
    • R(c);OGATEB,P_SPINR(c),XP(H)::B(E),XR(b)
    • B(d);OGATEB,P_PINQ(I),P_SPINB(d),XP(H)::R(D)+B(E),XR(b)
  • Tries
    • Try
      • R(G);CHECK,XB(d)
      • Refutation
        • R(b);XR(G)
  • Actual
    • B(J);
    • Threat
      • QAB(I),XP(f)
    • Vars
      • Q(i);CHECK,OGATE,XS(L)::QAR(I),XQ(i)
      • Q(i);N_PINS(L),P_PINQ(I),P_SPINQ(i),XP(H)::S(L)
      • R(c);OGATEB,P_SPINR(c),XP(H)::B(E),XR(b)
      • B(d);OGATEB,P_PINQ(I),P_SPINB(d),XP(H)::R(D)+B(E),XR(b)
      • Q(i);N_GUARD,N_PINS(L)::QAR2(I),XQ(i)
      • Q(i);N_PINS(L)::S(L)
      • Q(i);N_GUARD::QAR2(I)
      • P(f);::QAB(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).