MESON Chess Problem Database

Problem Display
PID: 61133 (2R5/3p1pB1/8/K3N2r/n1Nk1b1R/2pP2rn/2p2pB1/5Q2 w - - 0 1)

Ellerman, Arnoldo

2nd Prize, Good Companions (May), 1919

2R5/3p1pB1/8/K3N2r/n1Nk1b1R/2pP2rn/2p2pB1/5Q2

#2

9 + 11

3132 The Good Companion Two-Mover 1919
81 Chess 1947
721 Variantim 1989
721 Variantim 1992

SOLUTION

  • SOUND
  • Sets
    • 1...Rxd3
      • 2.Qxd3#
    • 1...Rxe5+
      • 2.Bxe5#
    • 1...Sg1
      • 2.Rxf4#
    • 1...Sg5
      • 2.Sxf7#
    • 1...Sc5
      • 2.Sc6#
    • 1...d5
      • 2.Sf3#
    • 1...f5
      • 2.Sg6#
  • Tries
    • 1.Qxf2+?
      • 1...Re3
        • 2.Qxe3#
      • 1...Sxf2!
  • Keys
    • 1.Qe2!
      • threat
        • 2.Qe4#
      • 1...Rxe5+
        • 2.Bxe5#
      • 1...Re3
        • 2.Qxe3#
      • 1...Sg5
        • 2.Sxf7#
      • 1...Sc5
        • 2.Sc6#
      • 1...d5
        • 2.Sf3#
      • 1...f5
        • 2.Sg6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 2
  • Sets
    • R(d);OGATE,XP(C)::QAR1(A),XR(d)
    • R(i);CHECK,OGATE,P_SPINR(i),XS(G)::B(H),XR(i)
    • S(e);N_GUARD::R(E),XB(h)
    • S(e);N_PINS(G)::B(H)+S(G),XP(k)
    • S(f);N_PINS(G),SBLOCK::B(H)+S(G),DCHECK
    • P(j);N_PINS(G),SBLOCK::B(H)+S(G),DCHECK
    • P(k);N_PINS(G)::B(H)+S(G)
  • Tries
    • Try
      • Q(A);CHECK,XP(b)
      • Vars
        • R(d);N_GUARD,P_SPINR(d)::QAB1(A),XR(d)
      • Refutation
        • S(e);XQ(A)
  • Actual
    • Q(A);
    • Threat
      • QAR1(A)
    • Vars
      • R(i);CHECK,OGATE,P_SPINR(i),XS(G)::B(H),XR(i)
      • R(d);N_GUARD::QAB1(A),XR(d)
      • S(e);N_PINS(G)::B(H)+S(G),XP(k)
      • S(f);N_PINS(G),SBLOCK::B(H)+S(G),DCHECK
      • P(j);N_PINS(G),SBLOCK::B(H)+S(G),DCHECK
      • P(k);N_PINS(G)::B(H)+S(G)
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