MESON Chess Problem Database

Problem Display
PID: 21947 (8/2p1B3/2p5/1pNknqR1/2bb1pp1/7N/B3P3/2QR1K2 w - - 0 1)

Ellerman, Arnoldo

3rd Prize=, Good Companions (March), 1922

8/2p1B3/2p5/1pNknqR1/2bb1pp1/7N/B3P3/2QR1K2

#2

9 + 10

3132 The Good Companion Two-Mover 1922
887 Mate in Two Moves 1931
14868 Pirnie Collection 2013

SOLUTION

  • SOUND
  • Sets
    • 1...Qb1
      • 2.Sxf4#
    • 1...Qc2
      • 2.Sxf4#
    • 1...Qd3
      • 2.Sxf4#
    • 1...Qe6
      • 2.Sxf4#
    • 1...Qg6
      • 2.Sxf4#
    • 1...Qd7
      • 2.Sxf4#
    • 1...Qh7
      • 2.Sxf4#
    • 1...Qc8
      • 2.Sxf4#
  • Tries
    • 1.Rxf5?
      • threat
        • 2.Sxf4#
      • 1...f3
        • 2.Sf4#
      • 1...gxh3!
    • 1.Qe3?
      • threat
        • 2.Rxd4#
        • 2.Qxd4#
      • 1...Qb1
        • 2.Sxf4#
        • 2.Rxe5#
        • 2.Qxd4#
        • 2.Qxe5#
      • 1...Qd3
        • 2.Sxf4#
      • 1...Qe4
        • 2.Qxe4#
      • 1...Sd3
        • 2.Qe4#
        • 2.Qe6#
      • 1...Sf3
        • 2.Sxf4#
        • 2.Qe4#
        • 2.Qe6#
      • 1...fxe3+!
    • 1.Qxc4+?
      • 1...Sxc4
        • 2.Rxf5#
      • 1...bxc4!
  • Keys
    • 1.Qxf4!
      • threat
        • 2.Rxd4#
      • 1...Qxf4+
        • 2.Sxf4#
      • 1...Qb1
        • 2.Rxe5#
        • 2.Qxe5#
        • 2.Qxd4#
        • 2.Qf7#
      • 1...Qd3
        • 2.Qf7#
      • 1...Qe4
        • 2.Qxe4#
        • 2.Qf7#
      • 1...Sd3
        • 2.e4#
      • 1...Sf3
        • 2.Qe4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 3
    • REMOVED MATES = 7
  • Sets
    • Q(h);N_GUARD,P_SPINS(g)::S(F),XP(c)
  • Tries
    • Try
      • R(H);P_PINS(g),XQ(h)
      • Threat
        • S(F),XP(c)
      • Vars
        • P(c);::S(F)
      • Refutation
        • P(d);XS(F)
    • Try
      • Q(A);
      • Threat
        • DUALS(2)
      • Vars
        • Q(h);N_GUARD,P_SPINS(g)::S(F),XP(c)
        • Q(h);N_GUARD,P_SPINS(g)::QAB1(A),XQ(h)
      • Refutation
        • P(c);CHECK,XQ(A)
    • Try
      • Q(A);CHECK,N_SPINP(E),P_PINB(b),XB(a)
      • Vars
        • S(g);P_SPINQ(h),P_SPINS(g),S_CUTP(e),XQ(A)::R(H),XQ(h)
      • Refutation
        • P(e);P_SPINP(e),XQ(A)
  • Actual
    • Q(A);P_SPINQ(A),XP(c)
    • Threat
      • R1(B),XB(b)
    • Vars
      • Q(h);CHECK,P_SPINS(g),XQ(A)::S(F),XQ(h)
      • Q(h);N_PINQ(A),P_SPINS(g)::QAB(A)
      • S(g);N_PINP(E),P_SPINQ(h)::P(E)
      • S(g);N_PINQ(A),P_SPINQ(h)::QAB1(A)
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