MESON Chess Problem Database

Problem Display
PID: 198363 (5N2/q1b1R1pp/2Q5/6NR/p2r1k1p/7B/1p2p2K/1b2n3 w - - 0 1)

Niemeijer, Meindert

Brisbane Courier, 1920

5N2/q1b1R1pp/2Q5/6NR/p2r1k1p/7B/1p2p2K/1b2n3

#2

7 + 12

6490 yacpdb 2019

SOLUTION

  • SOUND
  • Sets
    • 1...Rd3
      • 2.Re4#
      • 2.Qe4#
    • 1...Sc2
      • 2.Qf3#
    • 1...Sg2
      • 2.Qf3#
    • 1...Sd3
      • 2.Qf3#
    • 1...Sf3+
      • 2.Qxf3#
  • Tries
    • 1.Qf6+?
      • 1...Bf5
        • 2.Rxh4#
        • 2.Qxf5#
      • 1...gxf6!
    • 1.Qxc7+?
      • 1...Rd6
        • 2.Qxd6#
      • 1...Qxc7!
  • Keys
    • 1.Qc3!
      • threat
        • 2.Qe3#
      • 1...Sf3+
        • 2.Qxf3#
      • 1...Rd1
        • 2.Sfe6#
      • 1...Rd2
        • 2.Sfe6#
      • 1...Rd3
        • 2.Re4#
      • 1...Rb4
        • 2.Sfe6#
      • 1...Rc4
        • 2.Sfe6#
      • 1...Re4
        • 2.Rf7#
      • 1...Rd5
        • 2.Sfe6#
      • 1...Rd6
        • 2.Qe5#
      • 1...Rd7
        • 2.Sfe6#
      • 1...Rd8
        • 2.Sfe6#
      • 1...Bd3
        • 2.Qd2#
      • 1...Be4
        • 2.Sge6#
      • 1...Be5
        • 2.Sfe6#
      • 1...Sc2
        • 2.Qf3#
      • 1...Sg2
        • 2.Qf3#
      • 1...Sd3
        • 2.Qd2#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 13
    • REMOVED MATES = 0
  • Sets
    • S(b);N_GUARD::QAR1(E)
    • S(b);CHECK,N_GUARD::QAR1(E),XS(b)
  • Tries
    • Try
      • Q(E);CHECK
      • Refutation
        • P(k);XQ(E)
    • Try
      • Q(E);CHECK,XB(j)
      • Vars
        • R(f);N_GUARD,P_SPINR(f)::QAB(E),XR(f)
      • Refutation
        • Q(i);XQ(E)
  • Actual
    • Q(E);
    • Threat
      • QAB1(E)
    • Vars
      • S(b);CHECK,N_GUARD::QAR1(E),XS(b)
      • R(f);::S(G)
      • R(f);N_GUARD,S_CUTB(a)::R1(F)
      • R(f);S_CUTB(a)::R(F)
      • R(f);OGATE::QAB1(E)
      • B(a);S_CUTR(f)::QAB(E)
      • B(a);SBLOCK::S(C)
      • B(j);SBLOCK::S(G)
      • S(b);N_GUARD::QAR1(E)
      • S(b);S_CUTR(f)::QAB(E)
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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).