MESON Chess Problem Database

Problem Display
PID: 21330 (8/2PR2pB/5b2/K4N1r/4kBPp/2n5/5Q2/3b1n2 w - - 0 1)

Ellerman, Arnoldo

2nd Prize, Good Companions (February), 1918

8/2PR2pB/5b2/K4N1r/4kBPp/2n5/5Q2/3b1n2

#2

8 + 8

3132 The Good Companion Two-Mover 1922
81 Chess 1947
133 The Problemist Supplement 2003

SOLUTION

  • SOUND
  • Sets
    • 1...Rxf5+
      • 2.Bxf5#
    • 1...Rh6
      • 2.Sg3#
    • 1...Bd4
      • 2.Rxd4#
    • 1...Be5
      • 2.Sg3#
    • 1...Bg5
      • 2.Sg3#
      • 2.Rd4#
    • 1...Be7
      • 2.Rd4#
    • 1...Bd8
      • 2.Rd4#
    • 1...Sd2
      • 2.Qe3#
    • 1...Sh2
      • 2.Qe3#
    • 1...Se3
      • 2.Qxe3#
    • 1...Sg3
      • 2.Qe3#
    • 1...Sb5
      • 2.Sg3#
    • 1...Sd5
      • 2.Sg3#
      • 2.Sd6#
    • 1...g5
      • 2.Sg3#
      • 2.Sh6#
  • Keys
    • 1.Bh2!
      • threat
        • 2.Qf4#
      • 1...Rxf5+
        • 2.Bxf5#
      • 1...Sxh2
        • 2.Qe3#
      • 1...Bd4
        • 2.Rxd4#
      • 1...Sg3
        • 2.Qe3#
      • 1...Sd5
        • 2.Sd6#
      • 1...Bf3
        • 2.Qc2#
      • 1...Be5
        • 2.Sg3#
      • 1...Bg5
        • 2.Rd4#
      • 1...Se2
        • 2.Qg2#
      • 1...g5
        • 2.Sh6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 6
  • Sets
    • R(f);CHECK,OGATE,P_SPINR(f),XS(E)::B(H),XR(f)
    • R(f);N_PINS(E)::B(H)+S(E),DCHECK
    • B(g);N_GUARD::R1(G),XB(g)
    • B(g);N_PINS(E)::B(H)+S(E),DCHECK
    • B(g);N_GUARD::R1(G)
    • B(g);N_GUARD,P_PINP(F)::R1(G)
    • S(b);N_GUARD::QAR1(A)
    • S(b);N_GUARD::QAR1(A),XS(b)
    • S(c);N_PINS(E)::B(H)+S(E),DCHECK
  • Actual
    • B(B);
    • Threat
      • QAR1(A)
    • Vars
      • R(f);CHECK,OGATE,P_SPINR(f),XS(E)::B(H),XR(f)
      • S(b);N_GUARD,XB(B)::QAR1(A)
      • B(g);N_GUARD::R1(G),XB(g)
      • S(b);N_GUARD::QAR1(A)
      • S(c);N_PINS(E),SBLOCK::B(H)+S(E),DCHECK
      • B(a);N_GUARD,SBLOCK::QAB(A)
      • B(g);N_PINS(E),SBLOCK::B(H)+S(E),DCHECK
      • B(g);N_GUARD,N_PINS(E)::R1(G)
      • S(c);S_CUTB(a)::QAB(A)
      • P(h);N_PINS(E)::B(H)+S(E)
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