MESON Chess Problem Database

Problem Display
PID: 198335 (8/1pQ3NB/br6/3kB3/2Np4/1P6/5n2/b2R1K2 w - - 0 1)

Niemeijer, Meindert

1st HM., Gymnasiasten Schach Blad, 1920

8/1pQ3NB/br6/3kB3/2Np4/1P6/5n2/b2R1K2

#2

8 + 7

6490 yacpdb 2019

SOLUTION

  • SOUND
  • Sets
    • 1...Rb4
      • 2.Qd6#
    • 1...Rb5
      • 2.Se3#
      • 2.Qd6#
    • 1...Rd6
      • 2.Qxd6#
    • 1...Bxc4+
      • 2.bxc4#
    • 1...Sd3
      • 2.Sxb6#
    • 1...d3
      • 2.Se3#
      • 2.Sxb6#
  • Tries
    • 1.Qxb6?
      • threat
        • 2.Qd6#
      • 1...Se4
        • 2.Bg8#
      • 1...Bxc4+!
    • 1.Qd7+?
      • 1...Rd6
        • 2.Qxd6#
      • 1...Kc5!
  • Keys
    • 1.Bd6!
      • threat
        • 2.Qc5#
      • 1...Bxc4+
        • 2.bxc4#
      • 1...Rxd6
        • 2.Qxd6#
      • 1...Rb5
        • 2.Se3#
      • 1...Rc6
        • 2.Qf7#
      • 1...Sd3
        • 2.Sxb6#
      • 1...Se4
        • 2.Bg8#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 1
  • Sets
    • R(f);N_GUARD::QAR1(F)
    • R(f);N_GUARD::QAR1(F),XR(f)
    • B(e);CHECK,OGATE,XS(D)::P(C),XB(e)
    • S(b);N_PINS(D),N_SPINP(c)::S(D),XR(f)
  • Tries
    • Try
      • Q(F);XR(f)
      • Threat
        • QAR1(F)
      • Vars
        • S(b);SBLOCK::B(H)
      • Refutation
        • B(e);CHECK,XS(D)
    • Try
      • Q(F);CHECK
      • Vars
        • R(f);N_GUARD,P_SPINR(f)::QAR1(F),XR(f)
      • Refutation
        • K(d);N_SPINP(c),P-FLIGHT
  • Actual
    • B(E);
    • Threat
      • QAR1(F)
    • Vars
      • B(e);CHECK,OGATE,XS(D)::P(C),XB(e)
      • R(f);OGATE,XB(E)::QAR1(F),XR(f)
      • R(f);N_PINS(D)::S(D)
      • R(f);SBLOCK::QAB(F)
      • S(b);N_PINS(D),N_SPINP(c)::S(D),XR(f)
      • S(b);SBLOCK::B(H)
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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).