MESON Chess Problem Database

Problem Display
PID: 64470 (8/B4p2/4p1RQ/Rr1qkN2/3pB3/7n/b2N3K/b7 w - - 0 1)

Ellerman, Arnoldo

4th Prize, Good Companions (March), 1920

8/B4p2/4p1RQ/Rr1qkN2/3pB3/7n/b2N3K/b7

#2

8 + 9

3132 The Good Companion Two-Mover 1922
3391 Het Half Pin Thema 1924
3530 Het Half Pin Thema (II) 1947

SOLUTION

  • SOUND
  • Sets
    • 1...Qb3
      • 2.Bb8#
    • 1...Rb2
      • 2.Bxd4#
    • 1...Rb8
      • 2.Bxb8#
  • Tries
    • 1.Bb8+?
      • 1...Qd6
        • 2.Bxd6#
      • 1...Rxb8!
    • 1.Qg7+?
      • 1...Kf4
        • 2.Rg4#
      • 1...f6!
  • Keys
    • 1.Qh4!
      • threat
        • 2.Sf3#
      • 1...Qxe4
        • 2.Qxe4#
      • 1...Qb3
        • 2.Bb8#
      • 1...Rb2
        • 2.Bxd4#
      • 1...Rb3
        • 2.Sc4#
      • 1...Sg1
        • 2.Qg3#
      • 1...Sf4
        • 2.Qf6#
      • 1...Sg5
        • 2.Qg3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 1
  • Sets
    • Q(f);N_GUARD,P_SPINR(e)::B(H)
    • R(e);P_PINS(A),P_SPINQ(f),S_CUTB(a)::B(H),XP(d)
    • R(e);N_GUARD,P_SPINQ(f)::B(H),XR(e)
  • Tries
    • Try
      • B(H);CHECK
      • Vars
        • Q(f);N_GUARD,P_SPINQ(f),P_SPINR(e)::B(H),XQ(f)
      • Refutation
        • R(e);P_SPINQ(f),XB(H)
    • Try
      • Q(G);CHECK
      • Vars
        • K(g);S_FLIGHT::R1(F)
      • Refutation
        • P(i);P_SPINP(i)
  • Actual
    • Q(G);
    • Threat
      • S(A)
    • Vars
      • Q(f);OGATE,P_SPINR(e),XB(C)::QAR1(G),XQ(f)
      • Q(f);N_GUARD,P_SPINR(e)::B(H)
      • R(e);P_PINS(A),P_SPINQ(f),S_CUTB(a)::B(H),XP(d)
      • R(e);P_SPINQ(f),S_CUTB(b)::S(A)
      • S(c);N_GUARD::QAB(G)
      • S(c);SBLOCK::QAB1(G)
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