MESON Chess Problem Database

Problem Display
PID: 80446 (B2r4/4n1R1/2n5/3r4/Q2Pkp1N/bp2N3/2P2P2/B6K w - - 0 1)

Ellerman, Arnoldo

Good Companions (April), 1917

B2r4/4n1R1/2n5/3r4/Q2Pkp1N/bp2N3/2P2P2/B6K

#2

10 + 8

3391 Het Half Pin Thema 1924

SOLUTION

  • SOUND
  • Sets
    • 1...Sb4
      • 2.Rxe7#
    • 1...Sxd4
      • 2.Qxd4#
    • 1...bxc2
      • 2.Qxc2#
    • 1...fxe3
      • 2.Rg4#
    • 1...f3
      • 2.Rg4#
  • Keys
    • 1.Qc4!
      • threat
        • 2.Qd3#
      • 1...Rxd4
        • 2.Qe6#
      • 1...Sxd4
        • 2.Qxd4#
      • 1...bxc2
        • 2.Qxc2#
      • 1...fxe3
        • 2.Rg4#
      • 1...f3
        • 2.Rg4#
      • 1...Sb4
        • 2.Rxe7#
      • 1...Se5
        • 2.dxe5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • S(f);N_GUARD,P_SPINR(e),S_CUTB(a)::R(I),XS(g)
    • S(f);OGATE,P_SPINR(e),P_SPINS(f),XP(G)::QAR1(F),XS(f)
    • P(b);OGATE,XP(C)::QAB(F),XP(b)
    • P(d);OGATEB,XS(E)::R(I)
    • P(d);OGATEB::R(I)
  • Actual
    • Q(F);
    • Threat
      • QAB1(F)
    • Vars
      • R(e);OGATE,P_SPINR(e),P_SPINS(f),XP(G)::QAR2(F)
      • S(f);OGATE,P_SPINR(e),P_SPINS(f),XP(G)::QAR1(F),XS(f)
      • P(b);OGATE,XP(C)::QAB(F),XP(b)
      • P(d);OGATEB,XS(E)::R(I)
      • P(d);OGATEB::R(I)
      • S(f);N_GUARD,P_SPINR(e),S_CUTB(a)::R(I),XS(g)
      • S(f);OGATE,P_SPINR(e)::QAR(F)+P(G),XS(f)
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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).