MESON Chess Problem Database

Problem Display
PID: 21335 (K2b1R1B/3P4/p1np1Np1/r4k2/r1Q1N2P/2pP1qP1/2B1P3/5R1b w - - 0 1)

Ellerman, Arnoldo

1st HM., Good Companions (January black Knight), 1918

K2b1R1B/3P4/p1np1Np1/r4k2/r1Q1N2P/2pP1qP1/2B1P3/5R1b

#2

13 + 11

3132 The Good Companion Two-Mover 1922

SOLUTION

  • SOUND
  • Sets
    • 1...Ke5
      • 2.Sg4#
    • 1...Re5
      • 2.Sxd6#
  • Tries
    • 1.Sg4+?
      • 1...Bf6
        • 2.Sxd6#
      • 1...Kxg4!
    • 1.Rxf3+?
      • 1...Ke5
        • 2.Sg4#
      • 1...Bxf3!
    • 1.Qd5+?
      • 1...Se5
        • 2.Sxd6#
      • 1...Rxd5!
  • Keys
    • 1.Sc5!
      • threat
        • 2.Qe6#
        • 2.d4#
      • 1...Sb4+
        • 2.Qe4#
      • 1...Sd4+
        • 2.Qd5#
      • 1...Se5+
        • 2.e4#
      • 1...Sa7+
        • 2.Qd5#
      • 1...Se7+
        • 2.Sd5#
      • 1...Sb8+
        • 2.Qd5#
      • 1...Ke5
        • 2.Sg4#
      • 1...Qxf1
        • 2.Qe6#
      • 1...Rxc4
        • 2.d4#
      • 1...Rxc5
        • 2.d4#
      • 1...Bxf6
        • 2.Qe6#
      • 1...dxc5
        • 2.d4#
      • 1...g5
        • 2.d4#
      • 1...Qf2
        • 2.Qe6#
      • 1...Qf4
        • 2.Qe6#
      • 1...Ra2
        • 2.Qe6#
        • 2.Qe4#
      • 1...d5
        • 2.d4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 15
    • REMOVED MATES = 1
  • Sets
    • K(f);N_SPINQ(c),P-FLIGHT::B(M)+S(I),DCHECK
    • R(e);SBLOCK::S(G),XP(i)
  • Tries
    • Try
      • S(I);CHECK
      • Vars
        • B(k);P_SPINB(k)::S(G),XP(i)
      • Refutation
        • K(f);N_SPINQ(c),S_FLIGHT,XS(I)
    • Try
      • R(A);CHECK,XQ(c)
      • Vars
        • K(f);P-FLIGHT::B(M)+S(I),DCHECK
      • Refutation
        • B(a);XR(A)
    • Try
      • Q(F);CHECK
      • Vars
        • S(h);P_SPINS(h)::S(G),XP(i)
      • Refutation
        • R(e);XQ(F)
  • Actual
    • S(G);
    • Threat
      • DUALS(2)
    • Vars
      • S(h);CHECK,S_CUTR(d)::QAB1(F)
      • S(h);CHECK,N_GUARD::QAR2(F)
      • S(h);CHECK,SBLOCK::P(C)
      • S(h);CHECK,S_CUTB(k)::R(L)+S(I)
      • K(f);N_SPINQ(c),P-FLIGHT::B(M)+S(I),DCHECK
      • Q(c);N_SPINQ(c),XR(A)::QAB1(F)
      • R(d);XQ(F)::B(B)+P(D)
      • R(e);XS(G)::B(B)+P(D)
      • B(k);P_SPINB(k),XS(I)::QAB1(F)
      • P(i);XS(G)::B(B)+P(D)
      • P(j);::B(B)+P(D)
      • Q(c);::QAB1(F)
      • P(i);::B(B)+P(D)
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).