MESON Chess Problem Database

Problem Display
PID: 198832 (r1n3NK/1nBpbQ2/1r3pP1/3P3R/R1B1k1P1/1NP1pb2/4p3/8 w - - 0 1)

Niemeijer, Meindert

De Maasbode, 1921

r1n3NK/1nBpbQ2/1r3pP1/3P3R/R1B1k1P1/1NP1pb2/4p3/8

#2

12 + 11

6490 yacpdb 2019

SOLUTION

  • SOUND
  • Sets
    • 1...Rd6
      • 2.Ba6#
    • 1...f5
      • 2.Qxf5#
  • Tries
    • 1.Bb5+?
      • 1...Bb4
        • 2.Rxb4#
      • 1...Rxa4!
    • 1.Re5+?
      • 1...fxe5
        • 2.Qf5#
      • 1...Kf4!
    • 1.Qxe7+?
      • 1...Re6
        • 2.Sxf6#
        • 2.Ba6#
      • 1...Sxe7!
  • Keys
    • 1.Rf5!
      • threat
        • 2.Rf4#
      • 1...Rd6
        • 2.Ba6#
      • 1...Bd6
        • 2.Sxf6#
      • 1...Sbd6
        • 2.Sc5#
      • 1...Scd6
        • 2.Qxe7#
      • 1...d6
        • 2.Qe6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 1
  • Sets
    • R(e);N_GUARD,S_CUTB(i)::R(C)+B(D)
    • P(f);OGATE::QAB1(J),XP(f)
  • Tries
    • Try
      • B(D);CHECK
      • Vars
        • B(i);N_GUARD,P_SPINB(i)::R(C),XB(i)
      • Refutation
        • R(j);XR(C)
    • Try
      • R(G);CHECK
      • Vars
        • P(f);OGATE,XR(G)::QAB1(J)
      • Refutation
        • K(d);P-FLIGHT,P_SPINP(f)
    • Try
      • Q(J);CHECK,XB(i)
      • Refutation
        • S(k);P_PINS(K),XQ(J)
  • Actual
    • R(G);
    • Threat
      • R1(G)
    • Vars
      • R(e);N_GUARD,S_CUTB(i)::R(C)+B(D)
      • B(i);N_GUARD,S_CUTR(e)::S(K),XP(f)
      • S(g);N_GUARD,S_CUTB(i)::S(A)
      • S(k);N_GUARD,P_PINS(K),S_CUTR(e)::QAR(J),XB(i)
      • P(h);N_GUARD,S_CUTR(e)::QAR2(J)
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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).