MESON Chess Problem Database

Problem Display
PID: 21516 (5bb1/Q2p3q/8/B7/RP1r1p2/N1kp4/1R6/K1N5 w - - 0 1)

Ellerman, Arnoldo

Good Companions (May), 1919

5bb1/Q2p3q/8/B7/RP1r1p2/N1kp4/1R6/K1N5

#2

8 + 8

3132 The Good Companion Two-Mover 1922
56 The Problemist 2008

SOLUTION

  • SOUND
  • Sets
    • 1...Rc4
      • 2.Sa2#
      • 2.Sb1#
      • 2.Sb5#
    • 1...Rd5
      • 2.Sa2#
    • 1...Rd6
      • 2.b5#
    • 1...Ba2
      • 2.Sxa2#
    • 1...Bc4
      • 2.Sb1#
    • 1...d5
      • 2.Sa2#
  • Tries
    • 1.Qc5+?
      • 1...Rc4
        • 2.Sa2#
        • 2.Sb1#
        • 2.Sb5#
        • 2.b5#
      • 1...Bc4
        • 2.Sa2#
        • 2.Sb1#
        • 2.Sb5#
        • 2.b5#
      • 1...Bxc5!
    • 1.Qc7+?
      • 1...Rc4
        • 2.Sb5#
      • 1...Bc4
        • 2.Sa2#
        • 2.Sb1#
        • 2.Sb5#
      • 1...Bc5!
  • Keys
    • 1.Qa6!
      • threat
        • 2.Sb1#
      • 1...Rxb4
        • 2.Qf6#
      • 1...Rc4
        • 2.Sb5#
      • 1...Re4
        • 2.Qxd3#
      • 1...Rd5
        • 2.Qc4#
      • 1...Rd6
        • 2.b5#
      • 1...Ba2
        • 2.Sxa2#
      • 1...d2
        • 2.Se2#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 4
    • REMOVED MATES = 2
  • Sets
    • R(c);S_CUTB(h)::S(B)
    • R(c);N_GUARD,S_CUTB(g)::B(G)+P(F)
    • B(h);N_GUARD::S(B),XB(h)
    • B(h);SBLOCK::S(D)
    • P(e);S_CUTB(h)::S(B)
  • Tries
    • Try
      • Q(H);CHECK
      • Refutation
        • B(g);XQ(H)
    • Try
      • Q(H);CHECK
      • Vars
        • R(c);P_SPINR(c)::S(D)
      • Refutation
        • B(g);P_SPINB(g)
  • Actual
    • Q(H);
    • Threat
      • S(D)
    • Vars
      • R(c);OGATEB,P_SPINR(c),XP(F)::QAB(H)
      • R(c);SBLOCK::S(D)
      • R(c);N_GUARD,S_CUTQ(f)::QAR1(H),XP(b)
      • R(c);N_GUARD,S_CUTB(h)::QAR1(H)
      • R(c);N_GUARD,S_CUTB(g)::B(G)+P(F)
      • B(h);N_GUARD::S(B),XB(h)
      • P(b);N_GUARD::S(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).