MESON Chess Problem Database

Problem Display
PID: 244427 (4R3/1QK2p2/2N1b1p1/4Pkp1/8/1p3Pnr/1nr1N3/BBb5 w - - 0 1)

Eerkes, Allard Pieter

Norsk Sjakkblad, 1934

4R3/1QK2p2/2N1b1p1/4Pkp1/8/1p3Pnr/1nr1N3/BBb5

#2

9 + 11

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Bf4
      • 2.Sd4#
    • 1...Bc4
      • 2.Scd4#
    • 1...Bc8
      • 2.Qxc8#
    • 1...Sc4
      • 2.Se7#
  • Tries
    • 1.Bxc2+?
      • 1...Sd3
        • 2.Se7#
      • 1...Se4
        • 2.Bxe4#
      • 1...bxc2!
  • Keys
    • 1.Qb4!
      • threat
        • 2.Qg4#
      • 1...g4
        • 2.Qxg4#
      • 1...Rh4
        • 2.Sxg3#
      • 1...Bf4
        • 2.Sd4#
      • 1...Bc4
        • 2.Scd4#
      • 1...Sc4
        • 2.Se7#
      • 1...Se4
        • 2.Qxe4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 1
  • Sets
    • B(a);P_PINP(E),SBLOCK::S(C)
    • B(i);N_PINS(F)::S(F)
    • B(i);OGATEB::QAB(G),XB(i)
    • S(b);N_PINS(F)::S(F)
  • Tries
    • Try
      • B(B);CHECK,N_SPINS(F),XR(c)
      • Vars
        • S(b);P_SPINS(b)::S(F)
        • S(e);N_GUARD,P_SPINS(e)::B(B),XS(e)
      • Refutation
        • P(d);XB(B)
  • Actual
    • Q(G);
    • Threat
      • QAB1(G)
    • Vars
      • P(h);::QAB1(G),XP(h)
      • R(f);N_GUARD::S(C),XS(e)
      • B(a);P_PINP(E),SBLOCK::S(C)
      • B(i);N_PINS(F)::S(F)
      • S(b);N_PINS(F)::S(F)
      • S(e);N_GUARD,N_SPINR(c)::QAB1(G),XS(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).