MESON Chess Problem Database

Problem Display
PID: 65109 (B5K1/6p1/2R1Np2/1p4r1/RnqBkp1N/8/2PP4/Q7 w - - 0 1)

Ellerman, Arnoldo

HM., Good Companions (May), 1922

B5K1/6p1/2R1Np2/1p4r1/RnqBkp1N/8/2PP4/Q7

#2

10 + 8

3132 The Good Companion Two-Mover 1922
14868 Pirnie Collection 2013

SOLUTION

  • SOUND
  • Sets
    • 1...Qd5
      • 2.Qe1#
    • 1...Qxe6+
      • 2.Rxe6#
    • 1...Qxd4
      • 2.Qxd4#
  • Tries
    • 1.Rxc4+?
      • 1...Rd5
        • 2.Sc5#
        • 2.Qe1#
      • 1...Sd5
        • 2.Sc5#
        • 2.Qe1#
        • 2.d3#
      • 1...Sc6!
    • 1.Qh1+?
      • 1...f3
        • 2.Qxf3#
      • 1...Rg2!
  • Keys
    • 1.Be5!
      • threat
        • 2.Rxc4#
      • 1...Qxe6+
        • 2.Rxe6#
      • 1...Kd5
        • 2.Rd6#
      • 1...Qxc2
        • 2.Qd4#
      • 1...Qxc6
        • 2.Bxc6#
        • 2.Qd4#
      • 1...Sxc2
        • 2.Rd6#
      • 1...Sxc6
        • 2.Bxc6#
      • 1...Qc3
        • 2.Rc5#
      • 1...Qd4
        • 2.Qxd4#
      • 1...Qf1
        • 2.Rc4#
        • 2.Rc5#
        • 2.Rca6#
        • 2.Rb6#
        • 2.Rd6#
        • 2.Rc7#
        • 2.Rc8#
        • 2.Qd4#
      • 1...Qa2
        • 2.Rc4#
        • 2.Qd4#
      • 1...Qe2
        • 2.Rc4#
        • 2.Rc5#
        • 2.Rca6#
        • 2.Rb6#
        • 2.Rd6#
        • 2.Rc7#
        • 2.Rc8#
        • 2.Qd4#
      • 1...Qb3
        • 2.Rc4#
        • 2.Qd4#
      • 1...Qd3
        • 2.Rc4#
      • 1...Qd5
        • 2.Qe1#
      • 1...Qc5
        • 2.Rxc5#
      • 1...Sd5
        • 2.Sc5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 8
    • REMOVED MATES = 0
  • Sets
    • Q(b);N_GUARD,SBLOCK::QAR(A)
    • Q(b);CHECK,OGATE,XS(H)::B(I)+R(G),DCHECK,XQ(b)
    • Q(b);N_PINS(H),OGATE,XB(E)::QAR1(A),XQ(b)
  • Tries
    • Try
      • R(G);CHECK,N_SPINS(H),XQ(b)
      • Refutation
        • S(a);P_SPINS(a)
    • Try
      • Q(A);CHECK
      • Vars
        • P(d);P_SPINP(d)::QAB1(A),XP(d)
      • Refutation
        • R(f);P_SPINR(f)
  • Actual
    • B(E);
    • Threat
      • B(I)+R(G),DCHECK,XQ(b)
    • Vars
      • Q(b);CHECK,OGATE,P_SPINS(a),XS(H)::B(I)+R(G),XQ(b)
      • K(c);N_PINS(H),S_FLIGHT::B(I)+R(G),DCHECK
      • Q(b);N_GUARD,N_PINS(H),P_SPINS(a),XP(B)::QAR1(A)
      • S(a);N_GUARD,P_SPINQ(b),XP(B)::B(I)+R(G)
      • S(a);OGATE,P_SPINQ(b),P_SPINS(a),XR(G)::B(I),XS(a)
      • Q(b);N_GUARD,N_PINS(H),P_SPINS(a)::B(I)+R(G)
      • Q(b);N_GUARD,N_PINS(H)::QAR1(A),XQ(b)
      • Q(b);N_PINS(H),P_SPINS(a)::B(I)+R(G),DCHECK
      • Q(b);N_GUARD,P_SPINS(a),SBLOCK::QAR(A)
      • Q(b);N_GUARD,N_PINS(H),P_SPINS(a)::B(I)+R(G),XQ(b)
      • S(a);N_PINS(H),P_SPINQ(b),SBLOCK::S(H)
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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).