MESON Chess Problem Database

Problem Display
PID: 65065 (K2R3B/p7/5rp1/2PNr3/R1Pk2Nq/Q2B2b1/2P2p2/7b w - - 0 1)

Ellerman, Arnoldo

2nd Prize, Good Companions (October), 1921

K2R3B/p7/5rp1/2PNr3/R1Pk2Nq/Q2B2b1/2P2p2/7b

#2

11 + 9

3132 The Good Companion Two-Mover 1922
5454 Near Snap 2007

SOLUTION

  • SOUND
  • Sets
    • 1...Re4
      • 2.Sf4#
    • 1...Rxd5
      • 2.cxd5#
    • 1...Rf3
      • 2.Se7#
    • 1...Rf4
      • 2.Bxe5#
    • 1...Bxd5+
      • 2.cxd5#
  • Tries
    • 1.Bf5?
      • threat
        • 2.c3#
      • 1...Bxd5+
        • 2.cxd5#
      • 1...Rexf5
        • 2.Qe3#
      • 1...Rfxf5
        • 2.Qe3#
      • 1...Re3
        • 2.Qxe3#
      • 1...Re4
        • 2.Sf4#
      • 1...Be4
        • 2.Qe3#
      • 1...gxf5!
    • 1.Ra5?
      • threat
        • 2.Qb2#
        • 2.Qa1#
        • 2.Qc3#
      • 1...Rxd5
        • 2.Qb2#
        • 2.Qa1#
      • 1...f1Q
        • 2.Qb2#
        • 2.Qc3#
      • 1...f1R
        • 2.Qb2#
        • 2.Qc3#
      • 1...Re1
        • 2.Qb2#
        • 2.Qc3#
      • 1...Rb6
        • 2.Qc3#
      • 1...Bxd5+!
  • Keys
    • 1.Bxg6!
      • threat
        • 2.c3#
      • 1...Bxd5+
        • 2.cxd5#
      • 1...Rxg6
        • 2.Qe3#
      • 1...Ref5
        • 2.Qe3#
      • 1...Rff5
        • 2.Qe3#
      • 1...Re3
        • 2.Qxe3#
      • 1...Re4
        • 2.Sf4#
      • 1...Rf3
        • 2.Se7#
      • 1...Be4
        • 2.Qe3#

This anticipates 38475(1934-1935)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 2
  • Sets
    • R(f);N_PINS(H),P_SPINR(g)::R(J)+S(H)
    • R(f);OGATE,P_SPINR(f),XS(H)::R(D)+P(E),XR(f)
    • R(g);N_PINS(H),P_SPINR(f)::R(J)+S(H)
    • R(g);OGATE,P_SPINR(f)::B(K),XR(f)
    • B(a);CHECK,OGATE,P_SPINB(a),XS(H)::R(D)+P(E),XB(a)
  • Tries
    • Try
      • B(C);
      • Threat
        • P(A)
      • Vars
        • B(a);CHECK,OGATE,P_SPINB(a),XS(H)::R(D)+P(E),XB(a)
        • R(f);N_GUARD,P_SPINR(g),XB(C)::QAB1(B)
        • R(g);P_SPINR(f),XB(C)::QAB1(B)
        • R(f);N_GUARD,P_SPINR(g)::QAB1(B),XR(f)
        • R(f);N_PINS(H),P_SPINR(g)::R(J)+S(H)
        • B(a);S_CUTR(f)::QAB1(B)
      • Refutation
        • P(h);XB(C)
    • Try
      • R(D);
      • Threat
        • DUALS(3)
      • Vars
        • R(g);P_SPINR(f)::QAB1(B)
      • Refutation
        • B(a);CHECK,P_SPINB(a),XS(H)
  • Actual
    • B(C);XP(h)
    • Threat
      • P(A)
    • Vars
      • B(a);CHECK,OGATE,P_SPINB(a),XS(H)::R(D)+P(E),XB(a)
      • R(g);P_SPINR(f),XB(C)::QAB1(B)
      • R(f);N_GUARD,P_SPINR(g)::QAB1(B)
      • R(g);P_SPINR(f)::QAB1(B)
      • R(f);N_GUARD,P_SPINR(g)::QAB1(B),XR(f)
      • R(f);N_PINS(H),P_SPINR(g)::R(J)+S(H)
      • R(g);N_PINS(H),P_SPINR(f)::R(J)+S(H)
      • B(a);S_CUTR(f)::QAB1(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).