MESON Chess Problem Database

Problem Display
PID: 21329 (8/2Q5/4bNP1/1P1p1p1p/K2k3r/3P1R2/2p2N2/b3r1B1 w - - 0 1)

Stubbs, Arthur Goodwin

1st Prize, Good Companions (February), 1918

8/2Q5/4bNP1/1P1p1p1p/K2k3r/3P1R2/2p2N2/b3r1B1

#2

9 + 9

3132 The Good Companion Two-Mover 1922
81 Chess 1950

SOLUTION

  • SOUND
  • Sets
    • 1...Rb1
      • 2.Sd1#
    • 1...Rc1
      • 2.Sd1#
    • 1...Rd1
      • 2.Sxd1#
    • 1...Ree4
      • 2.S2xe4#
    • 1...Re5
      • 2.S2e4#
  • Tries
    • 1.Qe5+?
      • 1...Kc5+
        • 2.S2e4#
      • 1...Rxe5
        • 2.S2e4#
      • 1...Kxe5+!
    • 1.Qc5+?
      • 1...Kxc5+
        • 2.S2e4#
      • 1...Ke5+!
  • Keys
    • 1.Qg7!
      • threat
        • 2.S6e4#
      • 1...Kc3+
        • 2.S6e4#
      • 1...Kc5+
        • 2.S2e4#
      • 1...Ke5+
        • 2.S6e4#
      • 1...Ree4
        • 2.S6xe4#
      • 1...Re5
        • 2.S2e4#
      • 1...Rhe4
        • 2.S6xe4#

There are these afters: 88299

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 4
    • REMOVED MATES = 3
  • Sets
    • R(b);N_GUARD::B(A)+S(B)
    • R(b);N_GUARD::B(A)+S(B),XR(b)
  • Tries
    • Try
      • Q(I);CHECK
      • Vars
        • K(d);CHECK,P_SPINP(f),S_FLIGHT::B(A)+S(B),DCHECK
        • R(b);SBLOCK,XQ(I)::B(A)+S(B)
      • Refutation
        • K(d);CHECK,S_FLIGHT,XQ(I)
    • Try
      • Q(I);CHECK
      • Vars
        • K(d);CHECK,S_FLIGHT,XQ(I)::B(A)+S(B),DCHECK
      • Refutation
        • K(d);CHECK,P_SPINP(f),S_FLIGHT
  • Actual
    • Q(I);
    • Threat
      • QAB(I)+S(G)
    • Vars
      • K(d);CHECK,S_FLIGHT::QAB(I)+S(G),DCHECK
      • K(d);CHECK,S_FLIGHT::B(A)+S(B),DCHECK
      • K(d);CHECK,S_FLIGHT::QAB(I)+S(G)
      • R(b);::QAB(I)+S(G),XR(b)
      • R(b);N_GUARD,SBLOCK::B(A)+S(B)
      • R(e);::QAB(I)+S(G),XR(e)
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