MESON Chess Problem Database

Problem Display
PID: 63876 (1n1n1bB1/K3Pr1q/pPpNkBp1/3rP3/7p/1QNb4/8/8 w - - 0 1)

Ellerman, Arnoldo

Good Companions (May), 1918

1n1n1bB1/K3Pr1q/pPpNkBp1/3rP3/7p/1QNb4/8/8

#2

9 + 12

3132 The Good Companion Two-Mover 1922

SOLUTION

  • SOUND
  • Sets
    • 1...Kd7
      • 2.e8Q#
    • 1...Sd7
      • 2.exd8S#
    • 1...Sb7
      • 2.exf8S#
  • Tries
    • 1.Sce4?
      • threat
        • 2.Sc5#
      • 1...Kd7
        • 2.e8Q#
      • 1...Bc4
        • 2.Qh3#
      • 1...Sd7
        • 2.Sg5#
        • 2.exd8S#
      • 1...Sb7
        • 2.exf8S#
      • 1...c5
        • 2.Sxc5#
      • 1...Bxe4!
    • 1.Bxf7+?
      • 1...Kd7
        • 2.exd8Q#
        • 2.exd8R#
        • 2.exf8S#
        • 2.e8Q#
        • 2.e8B#
      • 1...Sxf7
        • 2.exf8S#
      • 1...Qxf7!
    • 1.Qxd5+?
      • 1...Kd7
        • 2.exd8Q#
        • 2.exd8R#
        • 2.e8Q#
        • 2.e8B#
      • 1...cxd5!
  • Keys
    • 1.Sa4!
      • threat
        • 2.Sc5#
      • 1...Kd7
        • 2.e8Q#
      • 1...Bc4
        • 2.Qh3#
      • 1...Sd7
        • 2.exd8S#
      • 1...Sb7
        • 2.exf8S#
      • 1...c5
        • 2.Sxc5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • K(f);N_PINP(H),N_SPINR(c),S_FLIGHT::P=Q
    • S(j);N_PINP(H),SBLOCK::PXS(k)=S
    • S(k);N_PINP(H)::PXB(l)=S
  • Tries
    • Try
      • S(B);
      • Threat
        • S(B)
      • Vars
        • K(f);N_PINP(H),N_SPINR(c),S_FLIGHT::P=Q
        • B(a);N_SPINR(c),OGATE,P_SPINR(h)::QAB(A)
        • S(k);N_PINP(H)::PXB(l)=S
        • P(e);::S(B),XP(e)
      • Refutation
        • B(a);XS(B)
    • Try
      • B(I);CHECK,N_SPINP(H),XR(h)
      • Vars
        • S(k);N_GUARD,S_CUTQ(i),XB(I)::PXB(l)=S
      • Refutation
        • Q(i);P_PINP(H),XB(I)
    • Try
      • Q(A);CHECK,P_PINR(h),XR(c)
      • Refutation
        • P(e);XQ(A)
  • Actual
    • S(B);
    • Threat
      • S(B)
    • Vars
      • K(f);N_PINP(H),N_SPINR(c),S_FLIGHT::P=Q
      • B(a);N_SPINR(c),OGATE,P_SPINR(h)::QAB(A)
      • S(j);N_PINP(H),SBLOCK::PXS(k)=S
      • S(k);N_PINP(H)::PXB(l)=S
      • P(e);::S(B),XP(e)
HTML5 logo

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).