MESON Chess Problem Database

Problem Display
PID: 64405 (5N1K/7B/bBpp1p1p/R1nnkN2/1b4Rr/2p2P1p/Q7/3r4 w - - 0 1)

Ellerman, Arnoldo

Good Companions (July), 1917

5N1K/7B/bBpp1p1p/R1nnkN2/1b4Rr/2p2P1p/Q7/3r4

#2

9 + 13

3132 The Good Companion Two-Mover 1922

SOLUTION

  • SOUND
  • Sets
    • 1...Sb3
      • 2.Qh2#
    • 1...Sd3
      • 2.Bd4#
      • 2.Qe2#
    • 1...Sa4
      • 2.Qh2#
    • 1...Se4
      • 2.f4#
    • 1...Se6
      • 2.Sd7#
    • 1...Sb7
      • 2.Qh2#
    • 1...Sd7
      • 2.Qh2#
    • 1...Se3
      • 2.Sd7#
      • 2.Qe6#
    • 1...Sf4
      • 2.Sd7#
    • 1...Sxb6
      • 2.Qe6#
    • 1...Sc7
      • 2.Sd7#
    • 1...Se7
      • 2.Sd7#
      • 2.Qe6#
  • Keys
    • 1.Bc7!
      • threat
        • 2.Bxd6#
      • 1...Sxc7
        • 2.Sd7#
      • 1...Sb3
        • 2.Qh2#
      • 1...Sd3
        • 2.Qe2#
      • 1...Sa4
        • 2.Qh2#
      • 1...Se4
        • 2.f4#
      • 1...Se6
        • 2.Sd7#
      • 1...Sb7
        • 2.Qh2#
      • 1...Sd7
        • 2.Qh2#
      • 1...Se3
        • 2.Sd7#
        • 2.Qe6#
      • 1...Sf4
        • 2.Sd7#
      • 1...Sb6
        • 2.Qe6#
      • 1...Se7
        • 2.Sd7#
        • 2.Qe6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 0
  • Sets
    • S(f);P_SPINS(g)::QAB(A)
    • S(f);P_SPINS(g),SBLOCK::P(B)
    • S(f);N_GUARD,P_SPINS(g),SBLOCK::S(H)
    • S(g);P_SPINS(f)::S(H)
    • S(g);OGATE,P_SPINS(f),XB(F)::QAR1(A)
  • Actual
    • B(F);P_PINP(k)
    • Threat
      • B(F),XP(k)
    • Vars
      • S(g);N_SPINP(k),P_SPINS(f),XB(F)::S(H)
      • S(f);P_SPINS(g)::QAB(A)
      • S(f);N_GUARD,P_SPINS(g),S_CUTB(i)::QAR(A)
      • S(f);P_SPINS(g),SBLOCK::P(B)
      • S(f);N_GUARD,P_SPINS(g),SBLOCK::S(H)
      • S(g);P_SPINS(f)::S(H)
      • S(g);OGATE,P_SPINS(f)::QAR1(A)
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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).