MESON Chess Problem Database

Problem Display
PID: 198307 (4bK2/3r1pp1/n7/5R2/2Bk1b1Q/R2Pp3/3N2p1/3n1q2 w - - 0 1)

Sheppard, Charles William

American Chess Bulletin, 1920

4bK2/3r1pp1/n7/5R2/2Bk1b1Q/R2Pp3/3N2p1/3n1q2

#2

7 + 11

6490 yacpdb 2019

SOLUTION

  • SOUND
  • Sets
    • 1...Qe2
      • 2.Qxf4#
    • 1...Qxd3
      • 2.Rxd3#
    • 1...Qe1
      • 2.Sf3#
      • 2.Qxf4#
    • 1...Qg1
      • 2.Sf3#
      • 2.Qxf4#
    • 1...Qh1
      • 2.Sf3#
      • 2.Qxf4#
    • 1...Qf3
      • 2.Sxf3#
    • 1...Rd5
      • 2.Rxd5#
    • 1...Ra7
      • 2.Rd5#
    • 1...Rb7
      • 2.Rd5#
    • 1...Rc7
      • 2.Rd5#
    • 1...Re7
      • 2.Rd5#
    • 1...Sf2
      • 2.Sf3#
    • 1...Sc3
      • 2.Sb3#
  • Tries
    • 1.Qf6+?
      • 1...Be5
        • 2.Qxe5#
      • 1...gxf6!
  • Keys
    • 1.Qe7!
      • threat
        • 2.Qe4#
      • 1...Qxd3
        • 2.Rxd3#
      • 1...Rxe7
        • 2.Rd5#
      • 1...Qf3
        • 2.Sxf3#
      • 1...Rd5
        • 2.Rxd5#
      • 1...Be5
        • 2.Qxe5#
      • 1...Bd6
        • 2.Rd5#
      • 1...Sf2
        • 2.Sf3#
      • 1...Sc3
        • 2.Sb3#
      • 1...Sc5
        • 2.Qxc5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 4
  • Sets
    • Q(b);N_GUARD::QAR2(E),XB(f)
    • Q(b);OGATE,XP(C)::R1(B),XQ(b)
    • Q(b);N_GUARD::S(A),XQ(b)
    • R(h);N_GUARD::R1(F),XR(h)
    • R(h);N_GUARD::R1(F)
    • S(a);S_CUTQ(b)::S(A)
    • S(a);SBLOCK::S(A)
  • Tries
    • Try
      • Q(E);CHECK,N_PINB(f)
      • Vars
        • B(f);N_GUARD,P_SPINB(f)::QAB1(E),XB(f)
      • Refutation
        • P(j);XQ(E)
  • Actual
    • Q(E);N_PINB(f)
    • Threat
      • QAR1(E)
    • Vars
      • Q(b);OGATE,XP(C)::R1(B),XQ(b)
      • R(h);N_GUARD,XQ(E)::R1(F)
      • Q(b);N_GUARD::S(A),XQ(b)
      • R(h);N_GUARD::R1(F),XR(h)
      • B(f);N_GUARD::QAB1(E),XB(f)
      • B(f);P_PINQ(E),S_CUTR(h)::R1(F)
      • S(a);S_CUTQ(b)::S(A)
      • S(a);SBLOCK::S(A)
      • S(g);N_GUARD::QAB1(E),XS(g)
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