MESON Chess Problem Database

Problem Display
PID: 183413 (QB3R1b/1r2pp1K/6R1/n1N1pN2/3P1k1P/6pB/p4PP1/1b3n2 w - - 0 1)

Sheppard, Charles William

American Chess Bulletin, 1941

QB3R1b/1r2pp1K/6R1/n1N1pN2/3P1k1P/6pB/p4PP1/1b3n2

#2

12 + 11

56 The Problemist 1943

SOLUTION

  • SOUND
  • Sets
    • 1...Rb2
      • 2.Qf3#
    • 1...Rb4
      • 2.Qf3#
    • 1...Rb5
      • 2.Qf3#
    • 1...Rb6
      • 2.Qf3#
    • 1...Ra7
      • 2.Qf3#
    • 1...Rc7
      • 2.Qf3#
    • 1...Rd7
      • 2.Qf3#
    • 1...Rxb8
      • 2.Qf3#
    • 1...Sd2
      • 2.fxg3#
    • 1...Sh2
      • 2.fxg3#
    • 1...Se3
      • 2.fxe3#
      • 2.fxg3#
  • Tries
    • 1.Se6+?
      • 1...fxe6
        • 2.Rg4#
      • 1...Ke4!
    • 1.Rxf7?
      • threat
        • 2.Rg4#
      • 1...Bxf5
        • 2.Rxf5#
      • 1...Sh2
        • 2.fxg3#
      • 1...Se3
        • 2.fxe3#
        • 2.fxg3#
      • 1...Bf6!
  • Keys
    • 1.Sxe7!
      • threat
        • 2.Sd5#
      • 1...Bxg6+
        • 2.Sxg6#
      • 1...Rxe7
        • 2.Qf3#
      • 1...Rd7
        • 2.Se6#
        • 2.Qf3#
      • 1...Be4
        • 2.Se6#
      • 1...Se3
        • 2.fxg3#
      • 1...f5
        • 2.Rg4#
      • 1...f6
        • 2.Bxe5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 6
    • REMOVED MATES = 10
  • Sets
    • R(h);OGATE::QAR1(J)
    • R(h);N_SPINP(g),OGATE::QAR1(J)
    • R(h);N_SPINP(g),OGATE,XB(K)::QAR1(J)
    • S(b);N_GUARD::P(A),XP(d)
  • Tries
    • Try
      • S(F);CHECK
      • Vars
        • P(j);XS(F)::R1(H)
      • Refutation
        • K(e);N_SPINP(g),P-FLIGHT,P_SPINR(h)
    • Try
      • R(L);XP(j)
      • Threat
        • R1(H)
      • Vars
        • B(a);OGATE,P_PINR(H),P_SPINB(a),XS(G)::R1(L),XB(a)
        • S(b);N_GUARD::P(A),XP(d)
      • Refutation
        • B(k);
  • Actual
    • S(G);P_SPINR(H),XP(i)
    • Threat
      • S(G)
    • Vars
      • B(a);CHECK,XR(H)::S(G),XB(a)
      • R(h);OGATE,XS(G)::QAR1(J)
      • B(a);SBLOCK::S(F)
      • S(b);N_GUARD,SBLOCK::P(A),XP(d)
      • P(j);N_PINR(H),P_PINS(G)::R1(H)
      • P(j);P_PINS(G),S_CUTB(k)::B(K),XP(g)
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