MESON Chess Problem Database

Problem Display
PID: 4683 (1bq5/1N6/p4R2/5pQP/3k1B2/N1RppB1K/1P6/8 w - - 0 1)

Greenshields, EB

4th Prize, Ottawa Citizen, 1886

1bq5/1N6/p4R2/5pQP/3k1B2/N1RppB1K/1P6/8

#2

10 + 7

4774 Canadian Chess Problems 1890

SOLUTION

  • SOUND
  • Sets
    • 1...Qxb7
      • 2.Rc4#
    • 1...Qd7
      • 2.Rc4#
    • 1...Qc4
      • 2.Rxc4#
    • 1...Qd8
      • 2.Rc4#
    • 1...Qe8
      • 2.Rc4#
    • 1...Qf8
      • 2.Rc4#
    • 1...Qh8
      • 2.Rc4#
    • 1...Bxf4
      • 2.Qxf4#
    • 1...Be5
      • 2.Bxe3#
    • 1...Bd6
      • 2.Rxd6#
    • 1...Ba7
      • 2.Rd6#
    • 1...Bc7
      • 2.Rc4#
    • 1...d2
      • 2.Sc2#
    • 1...e2
      • 2.Qg1#
    • 1...a5
      • 2.Sb5#
  • Tries
    • 1.Re6?
      • threat
        • 2.Bxe3#
      • 1...Bxf4
        • 2.Qxf4#
      • 1...e2
        • 2.Be3#
        • 2.Qg1#
      • 1...Qxe6!
    • 1.Qxf5?
      • threat
        • 2.Rxd3#
      • 1...Qxc3
        • 2.Qe4#
        • 2.Qd5#
      • 1...Qc4
        • 2.Rxc4#
        • 2.Qe4#
      • 1...d2
        • 2.Sc2#
        • 2.Bxe3#
        • 2.Rd3#
      • 1...Qxf5+!
    • 1.Qg7?
      • threat
        • 2.Rd6#
      • 1...Bd6
        • 2.Rxd6#
      • 1...Qe6!
  • Keys
    • 1.Sd8!
      • 1...Qxc3
        • 2.Se6#
      • 1...Qxd8
        • 2.Rc4#
      • 1...Bxf4
        • 2.Qxf4#
      • 1...Qc4
        • 2.Rxc4#
      • 1...Qe6
        • 2.Sxe6#
      • 1...Qb7
        • 2.Se6#
        • 2.Rc4#
      • 1...Qd7
        • 2.Rc4#
      • 1...Qc5
        • 2.Se6#
      • 1...Qc6
        • 2.Sxc6#
      • 1...Qc7
        • 2.Se6#
      • 1...Be5
        • 2.Bxe3#
      • 1...Bd6
        • 2.Rxd6#
      • 1...Ba7
        • 2.Rd6#
      • 1...Bc7
        • 2.Sc6#
        • 2.Rc4#
      • 1...d2
        • 2.Sc2#
      • 1...e2
        • 2.Qg1#
      • 1...a5
        • 2.Sb5#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 5
  • Sets
    • Q(g);N_GUARD,XS(J)::R1(C)
    • Q(g);N_GUARD::R1(C)
    • Q(g);N_GUARD::R1(C),XQ(g)
    • Q(g);N_GUARD,P_PINP(H)::R1(C)
    • B(f);OGATE,XB(F)::QAR2(G),XB(f)
    • B(f);SBLOCK::B(F),XP(b)
    • B(f);N_GUARD::R(I),XB(f)
    • B(f);N_GUARD::R(I)
    • B(f);S_CUTQ(g)::R1(C)
    • P(a);N_GUARD::S(B)
    • P(b);OGATEB::QAB(G)
    • P(e);N_GUARD::S(B)
  • Tries
    • Try
      • R(I);
      • Threat
        • B(F),XP(b)
      • Vars
        • B(f);OGATE,XB(F)::QAR2(G),XB(f)
      • Refutation
        • Q(g);XR(I)
    • Try
      • Q(G);P_SPINQ(G),XP(d)
      • Threat
        • R1(C),XP(a)
      • Refutation
        • Q(g);CHECK,XQ(G)
    • Try
      • Q(G);
      • Threat
        • QAB(G)+R(I),DCHECK
      • Vars
        • B(f);::QAB(G)+R(I),DCHECK,XB(f)
      • Refutation
        • Q(g);
  • Actual
    • S(J);
    • Vars
      • Q(g);N_GUARD,XR(C)::S(J)
      • Q(g);N_GUARD,XS(J)::R1(C)
      • B(f);OGATE,XB(F)::QAR2(G),XB(f)
      • Q(g);N_GUARD::R1(C),XQ(g)
      • Q(g);N_GUARD::S(J),XQ(g)
      • Q(g);N_GUARD::R1(C)
      • Q(g);N_GUARD::S(J)
      • B(f);SBLOCK::B(F),XP(b)
      • B(f);N_GUARD::R(I),XB(f)
      • B(f);N_GUARD::R(I)
      • P(a);N_GUARD::S(B)
      • P(b);OGATEB::QAB(G)
      • P(e);N_GUARD::S(B)
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