MESON Chess Problem Database

Problem Display
PID: 155398 (K2B4/n1PQ3P/4N3/p2pkpp1/4p3/3p1PR1/rN3P2/R3r1bq w - - 0 1)

Rietveld, Johannes Jacob

1st Prize, Suomen Shakki, 1952

K2B4/n1PQ3P/4N3/p2pkpp1/4p3/3p1PR1/rN3P2/R3r1bq

#2

11 + 12

56 The Problemist 1954

SOLUTION

  • SOUND
  • Sets
    • 1...Qg2
      • 2.h8Q#
      • 2.h8B#
    • 1...Qxf3
      • 2.h8Q#
      • 2.h8B#
    • 1...Bh2
      • 2.h8Q#
      • 2.h8B#
    • 1...exf3
      • 2.Rxe1#
    • 1...e3
      • 2.Sxd3#
    • 1...d4
      • 2.Sc4#
    • 1...f4
      • 2.Rxg5#
    • 1...g4
      • 2.f4#
  • Tries
    • 1.Qg7+?
      • 1...Kxe6
        • 2.Qe7#
      • 1...Kd6!
  • Keys
    • 1.fxe4!
      • threat
        • 2.Qxd5#
      • 1...Kxe4
        • 2.Rxe1#
      • 1...Qxe4
        • 2.h8Q#
        • 2.h8B#
      • 1...Rxe4
        • 2.Sxd3#
      • 1...dxe4
        • 2.Sc4#
      • 1...fxe4
        • 2.Rxg5#
      • 1...d4
        • 2.Qd5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 4
    • REMOVED MATES = 4
  • Sets
    • Q(c);N_GUARD::P=Q
    • Q(c);N_GUARD,XP(D)::P=Q
    • B(b);S_CUTQ(c)::P=Q
    • P(f);OGATEB,XP(D)::R(A),XR(a)
    • P(f);N_GUARD::S(B),XP(e)
    • P(h);N_GUARD::S(B)
    • P(j);OGATEB::R(E),XP(k)
    • P(k);N_GUARD::P(D)
  • Tries
    • Try
      • Q(H);CHECK
      • Vars
        • K(i);OGATEB,P-FLIGHT,XS(F)::QAR1(H)
      • Refutation
        • K(i);S_FLIGHT
  • Actual
    • P(D);XP(f)
    • Threat
      • QAR1(H),XP(h)
    • Vars
      • K(i);OGATEB,P-FLIGHT,XP(D)::R(A),XR(a)
      • Q(c);N_GUARD,SBLOCK,XP(D)::P=Q
      • R(a);SBLOCK,XP(D)::S(B),XP(e)
      • P(h);N_GUARD,SBLOCK,XP(D)::S(B)
      • P(j);OGATEB,SBLOCK,XP(D)::R(E),XP(k)
      • P(h);P_PINP(D)::QAR1(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).