MESON Chess Problem Database

Problem Display
PID: 179126 (5b2/1p1K4/1rp2P2/2RNkp2/R1n2pPQ/2P2r2/2nP2p1/1BN3q1 w - - 0 1)

Eerkes, Allard Pieter

Arbeidermagasinet, 1939

5b2/1p1K4/1rp2P2/2RNkp2/R1n2pPQ/2P2r2/2nP2p1/1BN3q1

#2

11 + 12

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Sets
    • 1...S2e3
      • 2.d4#
    • 1...Sd4
      • 2.Se7#
    • 1...S4e3
      • 2.Sd3#
    • 1...Sd6
      • 2.Se3#
  • Tries
    • 1.Se3+?
      • 1...Ke4
        • 2.Bxc2#
        • 2.Raxc4#
      • 1...Bxc5!
  • Keys
    • 1.Qg5!
      • threat
        • 2.Qxf5#
      • 1...Ke4
        • 2.Qxf5#
      • 1...Rxc3
        • 2.Qxf4#
      • 1...S2e3
        • 2.d4#
      • 1...Sd4
        • 2.Se7#
      • 1...S4e3
        • 2.Sd3#
      • 1...Sd6
        • 2.Se3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • S(b);N_GUARD,S_CUTQ(a)::P(C)
    • S(b);S_CUTQ(a)::R(H)+S(I)
    • S(e);S_CUTR(d)::S(B)
    • S(e);S_CUTB(l)::R(H)+S(I)
  • Tries
    • Try
      • S(I);CHECK
      • Refutation
        • B(l);XR(H)
  • Actual
    • Q(G);P_PINP(h)
    • Threat
      • QAR1(G),XP(h)
    • Vars
      • K(g);N_SPINP(h),P-FLIGHT,P_SPINS(b)::QAB1(G),XP(h)
      • R(d);N_GUARD,XP(D)::QAB1(G),XP(f)
      • S(b);N_GUARD,S_CUTQ(a)::P(C)
      • S(b);S_CUTQ(a)::R(H)+S(I)
      • S(e);S_CUTR(d)::S(B)
      • S(e);S_CUTB(l)::R(H)+S(I)
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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).