MESON Chess Problem Database

Problem Display
PID: 21362 (4R1K1/5nBB/5N1p/3N4/nQbk4/4pp2/8/6bq w - - 0 1)

Ellerman, Arnoldo

4th Prize, Good Companions (May), 1918

4R1K1/5nBB/5N1p/3N4/nQbk4/4pp2/8/6bq

#2

7 + 9

3132 The Good Companion Two-Mover 1922
133 The Problemist Supplement 2003

SOLUTION

  • SOUND
  • Sets
    • 1...Sb2
      • 2.Qb6#
    • 1...Sc3
      • 2.Qb6#
    • 1...Sc5
      • 2.Qc3#
      • 2.Qb2#
    • 1...Sb6
      • 2.Qxb6#
  • Tries
    • 1.Sc7?
      • threat
        • 2.Sb5#
      • 1...Se5+
        • 2.Se6#
      • 1...Sg5+
        • 2.Sfd5#
      • 1...Sd6+
        • 2.Sfd5#
      • 1...Sd8+
        • 2.Sfd5#
      • 1...Sh8+
        • 2.Sfd5#
      • 1...Sc3
        • 2.Qb6#
      • 1...Qh5!
    • 1.Se4+?
      • 1...Kd3
        • 2.Sg3#
      • 1...Kxd5
        • 2.Qb7#
      • 1...Se5!
    • 1.Sg4+?
      • 1...Kxd5
        • 2.Be4#
      • 1...Se5!
    • 1.Sh5+?
      • 1...Kxd5
        • 2.Be4#
      • 1...Se5!
    • 1.Sd7+?
      • 1...Kxd5
        • 2.Be4#
      • 1...Se5!
    • 1.Qb6+?
      • 1...Sc5
        • 2.Qb2#
      • 1...Sxb6!
  • Keys
    • 1.Sf4!
      • threat
        • 2.Re4#
      • 1...Se5+
        • 2.Se6#
      • 1...Sg5+
        • 2.S6d5#
      • 1...Sd6+
        • 2.S6d5#
      • 1...Sd8+
        • 2.S6d5#
      • 1...Sh8+
        • 2.S6d5#
      • 1...Sc3
        • 2.Qb6#
      • 1...Sc5
        • 2.Qb2#
      • 1...f2
        • 2.Se2#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 7
    • REMOVED MATES = 2
  • Sets
    • S(e);N_GUARD::QAB(A)
    • S(e);N_GUARD::QAB(A),XS(e)
  • Tries
    • Try
      • S(B);
      • Threat
        • S(B)
      • Vars
        • S(i);CHECK,SBLOCK::S(B)
        • S(i);CHECK,N_GUARD::B(D)+S(C)
        • S(e);N_GUARD,SBLOCK::QAB(A)
      • Refutation
        • Q(b);
    • Try
      • S(C);CHECK
      • Vars
        • K(g);N_SPINB(f),P-FLIGHT::B(E)+S(C)
        • K(g);N_SPINB(f),P-FLIGHT,XS(B)::QAB(A)
      • Refutation
        • S(i);P_PINS(B),P_SPINS(i)
    • Try
      • S(C);CHECK
      • Vars
        • K(g);N_SPINB(f),P-FLIGHT,XS(B)::B(E)
      • Refutation
        • S(i);P_PINS(B),P_SPINS(i)
    • Try
      • S(C);CHECK
      • Vars
        • K(g);N_SPINB(f),P-FLIGHT,XS(B)::B(E)
      • Refutation
        • S(i);P_PINS(B),P_SPINS(i)
    • Try
      • S(C);CHECK
      • Vars
        • K(g);N_SPINB(f),P-FLIGHT,XS(B)::B(E)
      • Refutation
        • S(i);P_PINS(B),P_SPINS(i)
    • Try
      • Q(A);CHECK,N_PINB(f)
      • Vars
        • S(e);N_GUARD,P_SPINS(e),SBLOCK::QAB(A)
      • Refutation
        • S(e);XQ(A)
  • Actual
    • S(B);
    • Threat
      • R1(F)
    • Vars
      • S(i);CHECK,SBLOCK::S(B)
      • S(i);CHECK,N_GUARD::B(D)+S(C)
      • S(e);N_GUARD,SBLOCK::QAB(A)
      • P(d);N_GUARD::S(B)
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