MESON Chess Problem Database

Problem Display
PID: 80629 (2r1R3/p3nrp1/3P4/QN2bp2/5p2/1Pp1k1N1/4p1P1/1B2K3 w - - 0 1)

Ellerman, Arnoldo

Good Companions (December), 1922

2r1R3/p3nrp1/3P4/QN2bp2/5p2/1Pp1k1N1/4p1P1/1B2K3

#2

9 + 11

3391 Het Half Pin Thema 1924

SOLUTION

  • SOUND
  • Sets
    • 1...Bf6
      • 2.Sxf5#
    • 1...Sd5
      • 2.Rxe5#
    • 1...Sc6
      • 2.Qxc3#
    • 1...Sg8
      • 2.Rxe5#
    • 1...c2
      • 2.Qd2#
  • Tries
    • 1.Sxf5+?
      • 1...Sxf5
        • 2.Rxe5#
      • 1...Rxf5!
    • 1.Qxa7+?
      • 1...Bd4
        • 2.Qxd4#
      • 1...Rc5!
  • Keys
    • 1.Sc7!
      • threat
        • 2.Qxe5#
      • 1...Kd4
        • 2.Qxa7#
      • 1...Bxd6
        • 2.Qxc3#
      • 1...c2
        • 2.Qd2#
      • 1...Bd4
        • 2.Sd5#
      • 1...Bf6
        • 2.Sxf5#
      • 1...Sd5
        • 2.Qc5#
      • 1...Sc6
        • 2.Qxc3#
      • 1...Sg6
        • 2.Qxc3#
        • 2.Qc5#
        • 2.Qxa7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 3
    • REMOVED MATES = 1
  • Sets
    • B(e);P_SPINS(h),S_CUTR(i)::S(E),XP(f)
    • S(h);OGATE,P_SPINB(e)::R(I),XB(e)
    • S(h);P_SPINB(e),S_CUTR(k)::QAR2(F),XP(b)
    • P(b);OGATE::QAB1(F)
  • Tries
    • Try
      • S(E);CHECK,XP(f)
      • Vars
        • S(h);OGATE,P_SPINB(e),XS(E)::R(I),XB(e)
      • Refutation
        • R(i);XS(E)
    • Try
      • Q(F);CHECK,XP(g)
      • Vars
        • B(e);N_GUARD,P_SPINB(e),P_SPINS(h)::QAB1(F),XB(e)
      • Refutation
        • R(k);P_SPINR(k)
  • Actual
    • S(G);
    • Threat
      • QAR2(F),XB(e)
    • Vars
      • K(c);S_FLIGHT::QAB(F),XP(g)
      • B(e);N_GUARD,P_SPINS(h),XP(H)::QAR2(F),XP(b)
      • P(b);OGATE::QAB1(F)
      • B(e);P_SPINS(h),SBLOCK::S(G)
      • B(e);P_SPINS(h),S_CUTR(i)::S(E),XP(f)
      • S(h);P_SPINB(e)::QAB(F)
      • S(h);P_SPINB(e)::QAR2(F),XP(b)
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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).