MESON Chess Problem Database

Problem Display
PID: 21508 (7b/5p1q/rR2N2p/1B1k4/1PN5/r2p4/P7/3KQ3 w - - 0 1)

Ellerman, Arnoldo

1st Prize, Good Companions (January), 1919

7b/5p1q/rR2N2p/1B1k4/1PN5/r2p4/P7/3KQ3

#2

8 + 8

3132 The Good Companion Two-Mover 1922
78 Bulletin Ouvrier des Echecs 1938
133 The Problemist Supplement 2003
133 The Problemist Supplement 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Ra4
      • 2.Rd6#
    • 1...Ra5
      • 2.Rd6#
    • 1...Ra7
      • 2.Rd6#
    • 1...Ra8
      • 2.Rd6#
    • 1...Bd4
      • 2.Sf4#
      • 2.Sc7#
    • 1...Be5
      • 2.Qxe5#
    • 1...f5
      • 2.Qh1#
  • Tries
    • 1.Bxa6?
      • threat
        • 2.Rd6#
      • 1...Be5
        • 2.Qxe5#
      • 1...Rxa6!
    • 1.Rxa6?
      • threat
        • 2.Rd6#
      • 1...Be5
        • 2.Qxe5#
      • 1...Rxa6!
    • 1.Qe3?
      • threat
        • 2.Sf4#
        • 2.Sc7#
      • 1...Qe4
        • 2.Sc7#
        • 2.Qc5#
      • 1...Qf5
        • 2.Sc7#
      • 1...Ra7
        • 2.Sf4#
        • 2.Rd6#
      • 1...Be5
        • 2.Qxe5#
      • 1...f5
        • 2.Sf4#
        • 2.Qf3#
      • 1...f6
        • 2.Sf4#
        • 2.Qd4#
      • 1...fxe6!
  • Keys
    • 1.Qh4!
      • threat
        • 2.Sc7#
      • 1...fxe6
        • 2.Bc6#
      • 1...Qe4
        • 2.Qd8#
      • 1...Ra7
        • 2.Rd6#
      • 1...Be5
        • 2.Se3#
      • 1...f5
        • 2.Qh1#
      • 1...f6
        • 2.Qd4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 3
    • REMOVED MATES = 3
  • Sets
    • R(d);N_GUARD::R1(G)
    • B(h);N_GUARD::QAR1(B),XB(h)
    • P(f);S_CUTQ(g)::QAB(B)
  • Tries
    • Try
      • B(F);XR(d)
      • Threat
        • R1(G)
      • Vars
        • B(h);N_GUARD::QAR1(B),XB(h)
      • Refutation
        • R(a);XB(F)
    • Try
      • R(G);XR(d)
      • Threat
        • R1(G)
      • Vars
        • B(h);N_GUARD::QAR1(B),XB(h)
      • Refutation
        • R(a);XR(G)
    • Try
      • Q(B);
      • Threat
        • DUALS(2)
      • Vars
        • Q(g);::S(H)
        • B(h);N_GUARD::QAR1(B),XB(h)
      • Refutation
        • P(f);XS(H)
  • Actual
    • Q(B);
    • Threat
      • S(H)
    • Vars
      • P(f);SBLOCK,XS(H)::B(F)
      • Q(g);SBLOCK::QAR(B)
      • R(d);N_GUARD::R1(G)
      • B(h);SBLOCK::S(E)
      • P(f);S_CUTQ(g)::QAB(B)
      • P(f);S_CUTB(h)::QAR1(B)
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