MESON Chess Problem Database

Problem Display
PID: 21835 (7B/8/5P1p/R3q2P/2R1NkBp/2n2P2/1Qbr1p1K/3N1r1n w - - 0 1)

Stubbs, Arthur Goodwin

Good Companions (May), 1921

7B/8/5P1p/R3q2P/2R1NkBp/2n2P2/1Qbr1p1K/3N1r1n

#2

11 + 10

3132 The Good Companion Two-Mover 1922

SOLUTION

  • SOUND
  • Sets
    • 1...Qd4
      • 2.Rf5#
    • 1...Qd6
      • 2.Rf5#
    • 1...Qc7
      • 2.Rf5#
    • 1...Qb8
      • 2.Rf5#
    • 1...Qxe4
      • 2.Rf5#
    • 1...Qf5
      • 2.Rxf5#
    • 1...Qe7
      • 2.Rf5#
    • 1...Qe8
      • 2.Rf5#
    • 1...Bb1
      • 2.Qxd2#
    • 1...Bxd1
      • 2.Qxd2#
    • 1...Bb3
      • 2.Qxd2#
    • 1...Bd3
      • 2.Qxd2#
    • 1...Ba4
      • 2.Qxd2#
    • 1...Bxe4
      • 2.Qxd2#
    • 1...Sb1
      • 2.Qxe5#
    • 1...Sa2
      • 2.Qxe5#
    • 1...Se2
      • 2.Qxe5#
    • 1...Sa4
      • 2.Qxe5#
    • 1...Sxe4
      • 2.Qxe5#
  • Tries
    • 1.Sg5+?
      • 1...Qd4
        • 2.Sh3#
        • 2.Se6#
        • 2.Qb8#
      • 1...Qe4
        • 2.Sh3#
        • 2.Se6#
        • 2.Rf5#
      • 1...Rd4
        • 2.Sh3#
      • 1...Be4
        • 2.Sh3#
        • 2.Qxd2#
      • 1...Se4
        • 2.Sh3#
        • 2.Qxe5#
      • 1...Kxg5+!
  • Keys
    • 1.Sexf2+!
      • 1...Kg5+
        • 2.f4#
      • 1...Qd4
        • 2.Qb8#
      • 1...Qe4
        • 2.Rf5#
      • 1...Rd4
        • 2.Sh3#
      • 1...Be4
        • 2.Qxd2#
      • 1...Se4
        • 2.Qxe5#

FEATURES

  • Static
    • TYPE = CHECKING_KEY
    • CHANGED MATES = 1
    • ADDED MATES = 2
    • REMOVED MATES = 15
  • Sets
    • Q(i);OGATE::R1(H)
    • Q(i);OGATE,P_SPINQ(i),XS(F)::R1(H)
    • Q(i);OGATE::R1(H),XQ(i)
    • B(c);OGATE::QAB(B),XR(d)
    • B(c);OGATE,XS(A)::QAB(B),XR(d)
    • B(c);OGATE,P_SPINB(c),XS(F)::QAB(B),XR(d)
    • S(f);OGATE::QAB1(B),XQ(i)
    • S(f);OGATE,P_SPINS(f),XS(F)::QAB1(B),XQ(i)
  • Tries
    • Try
      • S(F);CHECK
      • Vars
        • R(d);P_SPINR(d)::S(F)
      • Refutation
        • K(g);CHECK,P_SPINQ(i),S_FLIGHT,XS(F)
  • Actual
    • S(F);CHECK,P_SPINS(F),XP(e)
    • Vars
      • K(g);CHECK,OGATE,P_SPINQ(i),S_FLIGHT::P(D)
      • Q(i);P_SPINQ(i),S_CUTB(c),S_CUTR(d),S_CUTS(f)::QAB(B)
      • Q(i);OGATE,P_SPINQ(i)::R1(H)
      • R(d);N_PINS(F),P_SPINR(d)::S(F)
      • B(c);OGATE,P_SPINB(c)::QAB(B),XR(d)
      • S(f);OGATE,P_SPINS(f)::QAB1(B),XQ(i)
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