MESON Chess Problem Database

Problem Display
PID: 101187 (3R2bq/2p1Q2p/4P1P1/2pN1P2/nrrk1B2/5KP1/Pn1pP3/N3b3 w - - 0 1)

Pirnie, Duncan

Good Companions, 1920

3R2bq/2p1Q2p/4P1P1/2pN1P2/nrrk1B2/5KP1/Pn1pP3/N3b3

#2

12 + 12

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Qf6
      • 2.Qxf6#
    • 1...Qg7
      • 2.Qxg7#
    • 1...Rb3+
      • 2.Sxb3#
    • 1...Rc3+
      • 2.Se3#
    • 1...Sd3
      • 2.e3#
    • 1...Sc3
      • 2.Sc2#
  • Keys
    • 1.Qh4!
      • threat
        • 2.Bxc7#
      • 1...Rb3+
        • 2.Sxb3#
      • 1...Rc3+
        • 2.Se3#
      • 1...Bxg3
        • 2.Bxg3#
      • 1...hxg6
        • 2.Qxh8#
      • 1...Qe5
        • 2.Be3#
      • 1...Qf6
        • 2.Qxf6#
      • 1...Sd3
        • 2.e3#
      • 1...Sc3
        • 2.Sc2#
      • 1...c6
        • 2.Bc7#
        • 2.Bb8#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 1
  • Sets
    • Q(l);N_GUARD::QAB(K),XQ(l)
    • R(e);CHECK,N_GUARD::S(A),XR(e)
    • R(f);CHECK,SBLOCK::R(L)+S(G)
    • S(b);SBLOCK::P(C)
    • S(d);S_CUTR(f)::S(A)
  • Actual
    • Q(K);
    • Threat
      • QAR(K)+B(F),XP(i)
    • Vars
      • R(e);CHECK,N_GUARD::S(A),XR(e)
      • R(f);CHECK,SBLOCK::R(L)+S(G)
      • B(a);OGATE,XP(E)::QAR(K)+B(F),XB(a)
      • P(j);OGATE,XP(J)::QAB(K),XQ(l)
      • Q(l);SBLOCK::QAR(K)+B(F),DCHECK
      • Q(l);N_GUARD::QAB(K),XQ(l)
      • S(b);SBLOCK::P(C)
      • S(d);S_CUTR(f)::S(A)
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Developed and maintained by Brian Stephenson.
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