MESON Chess Problem Database

Problem Display
PID: 21214 (4N1RK/b7/5p2/1n3k1P/B6R/2prpnBb/Q2p2Nq/8 w - - 0 1)

Ellerman, Arnoldo

Good Companions (July), 1917

4N1RK/b7/5p2/1n3k1P/B6R/2prpnBb/Q2p2Nq/8

#2

9 + 11

3132 The Good Companion Two-Mover 1922

SOLUTION

  • SOUND
  • Sets
    • 1...Rd4
      • 2.Sxe3#
    • 1...Sfd4
      • 2.Qd5#
    • 1...Se5
      • 2.Rf4#
    • 1...Sg5
      • 2.Sg7#
    • 1...Sbd4
      • 2.Sd6#
    • 1...Sd6
      • 2.Bd7#
  • Tries
    • 1.Sd6+?
      • 1...Sxd6
        • 2.Bd7#
      • 1...Rxd6!
    • 1.Rg5+?
      • 1...Sxg5
        • 2.Sg7#
      • 1...fxg5
        • 2.Qf7#
      • 1...Kxg5!
    • 1.Qd5+?
      • 1...Se5
        • 2.Rf4#
      • 1...Rxd5!
  • Keys
    • 1.Qc4!
      • threat
        • 2.Qe4#
      • 1...Sxh4
        • 2.Sxh4#
      • 1...Rd4
        • 2.Sxe3#
      • 1...Bg4
        • 2.Qxg4#
      • 1...Bd4
        • 2.Qc8#
      • 1...Sfd4
        • 2.Qd5#
      • 1...Se5
        • 2.Rf4#
      • 1...Sg5
        • 2.Sg7#
      • 1...Sbd4
        • 2.Sd6#
      • 1...Sd6
        • 2.Bd7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • R(d);N_GUARD,S_CUTB(k)::S(B),XP(e)
    • S(f);N_GUARD,S_CUTR(d)::QAR2(A)
    • S(f);SBLOCK::R1(E)
    • S(f);SBLOCK::S(G)
    • S(h);N_GUARD,S_CUTR(d)::S(G)
    • S(h);OGATE::B(D)
  • Tries
    • Try
      • S(G);CHECK
      • Vars
        • S(h);OGATE,XS(G)::B(D)
      • Refutation
        • R(d);XS(G)
    • Try
      • R(H);CHECK
      • Vars
        • S(f);SBLOCK,XR(H)::S(G)
        • P(j);SBLOCK,S_CUTS(f),XR(H)::QAR2(A)
      • Refutation
        • K(i);P-FLIGHT,XR(H)
    • Try
      • Q(A);CHECK
      • Vars
        • S(f);P_SPINS(f)::R1(E)
      • Refutation
        • R(d);XQ(A)
  • Actual
    • Q(A);
    • Threat
      • QAB1(A)
    • Vars
      • S(f);XR(E)::S(B),XS(f)
      • R(d);N_GUARD,S_CUTB(k)::S(B),XP(e)
      • B(g);N_GUARD::QAB1(A),XB(g)
      • B(k);S_CUTR(d)::QAB(A)
      • S(f);N_GUARD,S_CUTR(d)::QAR2(A)
      • S(f);SBLOCK::R1(E)
      • S(f);SBLOCK::S(G)
      • S(h);N_GUARD,S_CUTR(d)::S(G)
      • S(h);OGATE::B(D)
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