MESON Chess Problem Database

Problem Display
PID: 21533 (5N1n/4p3/4P2p/RQq1p1k1/r2p2P1/r1p2R1K/p4N2/1b6 w - - 0 1)

Dawson, Thomas Rayner

2nd Prize, Good Companions (October Magee Jr TT), 1919

5N1n/4p3/4P2p/RQq1p1k1/r2p2P1/r1p2R1K/p4N2/1b6

#2

8 + 12

3132 The Good Companion Two-Mover 1922
3979 Systematic Terminology 1984
15256 TRD Scrapbook 2013

SOLUTION

  • SOUND
  • Sets
    • 1...Be4
      • 2.Sxe4#
    • 1...Bf5
      • 2.Rxf5#
    • 1...Sg6
      • 2.Sh7#
    • 1...c2
      • 2.Se4#
    • 1...d3
      • 2.Rf5#
    • 1...e4
      • 2.Qxc5#
  • Tries
    • 1.Kg3?
      • threat
        • 2.Sh3#
      • 1...Bf5
        • 2.Rxf5#
      • 1...h5!
    • 1.Qb2?
      • threat
        • 2.Qc1#
      • 1...Bf5
        • 2.Rxf5#
      • 1...Sg6
        • 2.Sh7#
      • 1...c2
        • 2.Se4#
      • 1...d3
        • 2.Rf5#
      • 1...e4
        • 2.Rxc5#
      • 1...cxb2!
    • 1.Qxc5?
      • threat
        • 2.Qxe7#
      • 1...Sg6
        • 2.Sh7#
      • 1...h5!
  • Keys
    • 1.Qf1!
      • threat
        • 2.Qc1#
      • 1...Bf5
        • 2.Rxf5#
      • 1...Sg6
        • 2.Sh7#
      • 1...c2
        • 2.Se4#
      • 1...d3
        • 2.Rf5#
      • 1...e4
        • 2.Rxc5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 0
    • REMOVED MATES = 1
  • Sets
    • B(a);N_GUARD::S(A),XB(a)
    • B(a);N_GUARD,P_PINP(D)::R1(B),XB(a)
    • S(l);SBLOCK,S_CUTB(a)::S(H)
    • P(d);P_PINR(B),S_CUTB(a)::S(A)
    • P(f);S_CUTB(a)::R1(B)
    • P(h);OGATEB,P_SPINQ(g)::QAR(F),XQ(g)
  • Tries
    • Try
      • K(C);P-FLIGHT
      • Threat
        • S(A)
      • Vars
        • B(a);N_GUARD::R1(B),XB(a)
      • Refutation
        • P(j);
    • Try
      • Q(F);
      • Threat
        • QAB(F)
      • Vars
        • B(a);N_GUARD,P_PINP(D)::R1(B),XB(a)
        • S(l);SBLOCK,S_CUTB(a)::S(H)
        • P(d);P_PINR(B),S_CUTB(a)::S(A)
        • P(f);S_CUTB(a)::R1(B)
        • P(h);OGATEB,P_SPINQ(g)::R(E),XQ(g)
      • Refutation
        • P(d);P_PINR(B),XQ(F)
    • Try
      • Q(F);P_PINP(h),XQ(g)
      • Threat
        • QAB(F),XP(k)
      • Vars
        • S(l);SBLOCK,S_CUTB(a)::S(H)
      • Refutation
        • P(j);
  • Actual
    • Q(F);
    • Threat
      • QAB(F)
    • Vars
      • B(a);N_GUARD,P_PINP(D)::R1(B),XB(a)
      • S(l);SBLOCK,S_CUTB(a)::S(H)
      • P(d);P_PINR(B),S_CUTB(a)::S(A)
      • P(f);S_CUTB(a)::R1(B)
      • P(h);OGATEB,P_SPINQ(g)::R(E),XQ(g)
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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).