MESON Chess Problem Database

Problem Display
PID: 139310 (RN2B2k/4p2p/7P/8/8/p1qP1P2/1r2P3/Bn4QK w - - 0 1)

Feenstra Kuiper, Pieter

Het Half Pin Thema (II), 1947

RN2B2k/4p2p/7P/8/8/p1qP1P2/1r2P3/Bn4QK

#2

10 + 7

SOLUTION

  • SOUND
  • Sets
    • 1...Qd2
      • 2.Qg7#
    • 1...Qb4
      • 2.Qg7#
    • 1...Qa5
      • 2.Qg7#
    • 1...Qg7
      • 2.Qxg7#
    • 1...Qc2
      • 2.Qg7#
    • 1...Qb3
      • 2.Qg7#
    • 1...Qxd3
      • 2.Qg7#
    • 1...Qc4
      • 2.Qg7#
    • 1...Qc5
      • 2.Qg7#
    • 1...Qc6
      • 2.Qg7#
    • 1...Qc7
      • 2.Qg7#
    • 1...Qc8
      • 2.Qg7#
    • 1...e5
      • 2.Qg7#
  • Keys
    • 1.Bf7!
      • threat
        • 2.Qg8#
      • 1...Rxb8
        • 2.Rxb8#
      • 1...Qe1
        • 2.Sa6#
        • 2.Sc6#
        • 2.Sd7#
      • 1...Qg7
        • 2.Qxg7#
        • 2.hxg7#
      • 1...Qc1
        • 2.Sc6#
      • 1...Qc8
        • 2.Qg7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 12
  • Sets
    • Q(d);N_GUARD,P_SPINR(b)::QAB1(B)
    • Q(d);N_GUARD::QAB1(B),XQ(d)
    • Q(d);N_GUARD,P_SPINR(b),XP(E)::QAB1(B)
    • Q(d);N_GUARD,P_PINP(F),P_SPINR(b)::QAB1(B)
    • P(e);S_CUTQ(d)::QAB1(B)
  • Actual
    • B(J);
    • Threat
      • QAR1(B)
    • Vars
      • R(b);OGATE,P_SPINQ(d),P_SPINR(b),XS(I)::R(H),XR(b)
      • Q(d);P_PINQ(B),P_SPINR(b)::R(H)+S(I)
      • Q(d);N_GUARD,P_SPINR(b)::QAB1(B)
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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).