MESON Chess Problem Database

Problem Display
PID: 64941 (4R3/2pQqr2/2P5/1p2k2N/1B2n2b/K2P2r1/1NP1nP2/4R2B w - - 0 1)

Ellerman, Arnoldo

Good Companions (May), 1922

4R3/2pQqr2/2P5/1p2k2N/1B2n2b/K2P2r1/1NP1nP2/4R2B

#2

12 + 9

3132 The Good Companion Two-Mover 1922

SOLUTION

  • SOUND
  • Sets
    • 1...Rxd3+
      • 2.Sxd3#
    • 1...Sc1
      • 2.Rxe4#
    • 1...Sg1
      • 2.Rxe4#
    • 1...S2c3
      • 2.d4#
    • 1...Sd4
      • 2.Rxe4#
    • 1...Sf4
      • 2.Rxe4#
    • 1...Sd2
      • 2.Qd5#
    • 1...Sxf2
      • 2.Qd5#
    • 1...S4c3
      • 2.d4#
    • 1...Sc5
      • 2.Bc3#
      • 2.Qd5#
    • 1...Sg5
      • 2.Qd5#
    • 1...Sd6
      • 2.Bc3#
    • 1...Sf6
      • 2.f4#
  • Tries
    • 1.f4+?
      • 1...Sxf4
        • 2.Rxe4#
      • 1...Rxf4!
  • Keys
    • 1.c4!
      • threat
        • 2.Qd5#
      • 1...Rxd3+
        • 2.Sxd3#
      • 1...bxc4
        • 2.Sxc4#
      • 1...Sd6
        • 2.Bc3#
      • 1...S2c3
        • 2.d4#
      • 1...Sf4
        • 2.Rxe4#
      • 1...S4c3
        • 2.d4#
      • 1...Sf6
        • 2.f4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 6
  • Sets
    • R(b);CHECK,XP(G)::S(C),XR(b)
    • S(a);OGATE,P_SPINS(c)::R1(A),XS(c)
    • S(a);N_PINP(G),P_SPINS(c)::P(G)
    • S(c);P_SPINS(a)::QAR1(K)
    • S(c);P_SPINS(a),XP(E)::QAR1(K)
    • S(c);N_PINP(G),P_SPINS(a)::P(G)
    • S(c);N_PINB(H),P_SPINS(a)::B(H)
    • S(c);P_SPINS(a),S_CUTR(i)::P(E)
  • Tries
    • Try
      • P(E);CHECK
      • Vars
        • S(a);OGATE,P_SPINS(c),XP(E)::R1(A),XS(c)
      • Refutation
        • R(i);XP(E)
  • Actual
    • P(D);
    • Threat
      • QAR1(K)
    • Vars
      • R(b);CHECK,XP(G)::S(C),XR(b)
      • P(e);XP(D)::S(C),XP(e)
      • S(c);N_PINB(H),P_SPINS(a)::B(H)
      • S(a);N_PINP(G),P_SPINS(c)::P(G)
      • S(a);OGATE,P_SPINS(c)::R1(A),XS(c)
      • S(c);N_PINP(G),P_SPINS(a)::P(G)
      • S(c);P_SPINS(a),S_CUTR(i)::P(E)
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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).