MESON Chess Problem Database

Problem Display
PID: 139356 (6r1/p1pPNpnq/Rb2kr2/7p/3R4/B3nB2/b1P3NQ/6K1 w - - 0 1)

Eerkes, Allard Pieter

2nd HM., BCPS 031. Ty., 1937

6r1/p1pPNpnq/Rb2kr2/7p/3R4/B3nB2/b1P3NQ/6K1

#2

10 + 12

56 The Problemist 1937

SOLUTION

  • SOUND
  • Sets
    • 1...Rc8
      • 2.dxc8Q#
      • 2.dxc8B#
    • 1...Se8
      • 2.d8S#
    • 1...c5
      • 2.Qd6#
    • 1...c6
      • 2.Qd6#
  • Tries
    • 1.Rd6+?
      • 1...cxd6
        • 2.Qxd6#
      • 1...Kxe7!
    • 1.Rxb6+?
      • 1...cxb6
        • 2.Qd6#
      • 1...c6
        • 2.Rxc6#
        • 2.Qd6#
      • 1...axb6!
  • Keys
    • 1.Qxc7!
      • threat
        • 2.Qd6#
      • 1...Sc4
        • 2.Bd5#
      • 1...Sef5
        • 2.Sf4#
      • 1...Sgf5
        • 2.Re4#
      • 1...Se8
        • 2.d8S#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 2
  • Sets
    • R(l);OGATE::PXR(l)=Q
    • S(j);P_PINS(C),S_CUTR(l)::P=S
    • P(h);N_GUARD::QAR1(D)
    • P(h);N_GUARD,N_SPINB(d)::QAR1(D)
  • Tries
    • Try
      • R(G);CHECK,N_PINB(d)
      • Vars
        • P(h);OGATE,XR(G)::QAR1(D),XP(h)
      • Refutation
        • K(e);P-FLIGHT,XS(J)
    • Try
      • R(H);CHECK,XB(d)
      • Vars
        • P(h);N_GUARD,XR(H)::QAR1(D)
      • Refutation
        • P(g);XR(H)
  • Actual
    • Q(D);XP(h)
    • Threat
      • QAR1(D)
    • Vars
      • S(b);N_GUARD,P_PINR(G),S_CUTB(a)::B(F)
      • S(b);P_PINR(G),S_CUTR(f)::S(C)
      • S(j);P_PINS(C),S_CUTQ(k)::R(G)
      • S(j);P_PINS(C),S_CUTR(l)::P=S
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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).