MESON Chess Problem Database

Problem Display
PID: 64856 (Qb6/7K/6R1/3ppN1p/Rn3k1P/2Nb3B/4rBP1/5n2 w - - 0 1)

Belli, Nicolo

Good Companions (February), 1922

Qb6/7K/6R1/3ppN1p/Rn3k1P/2Nb3B/4rBP1/5n2

#2

10 + 9

3132 The Good Companion Two-Mover 1922

SOLUTION

  • SOUND
  • Sets
    • 1...Be4
      • 2.Sxe2#
    • 1...Sd2
      • 2.Bg3#
    • 1...Sh2
      • 2.Bg3#
    • 1...Se3
      • 2.Bg3#
    • 1...Sg3
      • 2.Bxg3#
    • 1...d4
      • 2.Qf3#
    • 1...e4
      • 2.Qxb8#
  • Tries
    • 1.Rxb4+?
      • 1...Re4
        • 2.Sxd5#
      • 1...Be4
        • 2.Sxe2#
        • 2.Sxd5#
      • 1...d4
        • 2.Qf3#
      • 1...e4
        • 2.Qxb8#
      • 1...Bc4!
  • Keys
    • 1.Se7!
      • threat
        • 2.Sexd5#
      • 1...Bxg6+
        • 2.Sxg6#
      • 1...e4
        • 2.Qxb8#
      • 1...Re4
        • 2.Rf6#
      • 1...Bc4
        • 2.Rf6#
      • 1...Be4
        • 2.Sxe2#
      • 1...Se3
        • 2.Bg3#
      • 1...d4
        • 2.Qf3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 3
  • Sets
    • B(c);N_GUARD,N_SPINS(d),SBLOCK::S(C),XR(b)
    • S(a);N_GUARD::B(A)
    • S(a);N_GUARD::B(A),XS(a)
    • P(f);N_SPINS(d),OGATE::QAR1(J)
    • P(g);N_SPINS(d),OGATEB::QAB(J),XB(i)
  • Tries
    • Try
      • R(E);CHECK,XS(d)
      • Vars
        • R(b);P_SPINR(b)::S(C),XP(f)
        • P(f);OGATE,P_SPINP(f)::QAR1(J)
        • P(g);P_SPINP(g),S_CUTB(c),S_CUTB(c),S_CUTP(f),S_CUTR(b)::QAB(J),XB(i)
      • Refutation
        • B(c);P_SPINB(c)
  • Actual
    • S(G);P_SPINR(H)
    • Threat
      • S(G),XP(f)
    • Vars
      • B(c);CHECK,XR(H)::S(G),XB(c)
      • P(g);N_PINR(H),N_SPINS(d),OGATEB::QAB(J),XB(i)
      • R(b);N_PINR(H),N_SPINS(d)::R(H)
      • B(c);N_PINR(H),N_SPINS(d)::R(H)
      • B(c);N_GUARD,N_SPINS(d),SBLOCK::S(C),XR(b)
      • S(a);N_GUARD,SBLOCK::B(A)
      • P(f);N_SPINS(d),OGATE::QAR1(J)
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