MESON Chess Problem Database

Problem Display
PID: 50666 (2b5/2B3p1/4pnK1/1B1pP1N1/1P1kp1pR/r1p5/1pQ2P2/nq1N2r1 w - - 0 1)

Eerkes, Allard Pieter

HM., Die Schwalbe, 1936

2b5/2B3p1/4pnK1/1B1pP1N1/1P1kp1pR/r1p5/1pQ2P2/nq1N2r1

#2

10 + 14

5227 Schaak..., maar raak! 1969

SOLUTION

  • SOUND
  • Sets
    • 1...Ra2
      • 2.Qxc3#
    • 1...Ra4
      • 2.Qxc3#
    • 1...Ra5
      • 2.Qxc3#
    • 1...Ra6
      • 2.Qxc3#
    • 1...Ra7
      • 2.Qxc3#
    • 1...Ra8
      • 2.Qxc3#
    • 1...Ba6
      • 2.Sxe6#
    • 1...Bb7
      • 2.Sxe6#
    • 1...Sb3
      • 2.Qxc3#
    • 1...Sd7
      • 2.Sxe6#
    • 1...e3
      • 2.Sf3#
      • 2.fxe3#
    • 1...g3
      • 2.Sf3#
  • Tries
    • 1.Sf7?
      • threat
        • 2.Bb6#
      • 1...Ra6
        • 2.Qxc3#
      • 1...Sb3
        • 2.Qxc3#
      • 1...Sd7!
  • Keys
    • 1.f4!
      • threat
        • 2.Bb6#
      • 1...exf4 ep
        • 2.Sxf3#
      • 1...gxf4 ep
        • 2.Qf2#
      • 1...Ra6
        • 2.Qxc3#
      • 1...Sb3
        • 2.Qxc3#
      • 1...Sd7
        • 2.Sxe6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 8
  • Sets
    • R(e);N_GUARD::QAB1(B),XP(f)
    • B(n);N_GUARD::S(H),XP(k)
    • S(a);S_CUTR(e)::QAB1(B),XP(f)
    • S(l);S_CUTB(n)::S(H),XP(k)
    • P(i);N_GUARD,P_SPINP(h)::S(H)
  • Tries
    • Try
      • S(H);
      • Threat
        • B(J)
      • Vars
        • R(e);N_GUARD::QAB1(B),XP(f)
        • S(a);S_CUTR(e)::QAB1(B),XP(f)
      • Refutation
        • S(l);
  • Actual
    • P(C);
    • Threat
      • B(J)
    • Vars
      • P(h);EP,N_GUARD,P_PINQ(B),P_SPINP(i),XP(C)::S(H),XP(h)
      • P(i);EP,P_PINS(H),P_SPINP(h),XP(C)::QAB(B)
      • R(e);N_GUARD::QAB1(B),XP(f)
      • S(a);S_CUTR(e)::QAB1(B),XP(f)
      • S(l);S_CUTB(n)::S(H),XP(k)
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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).