MESON Chess Problem Database

Problem Display
PID: 222647 (3B3K/q2R1B2/2Pp4/p3pn2/P2kp3/Q2NpP2/b1R3N1/b5n1 w - - 0 1)

Hopkins, F O'Neill

English Mechanic and World of Science, 1884

(First published on Fri Jan 4 1884)

3B3K/q2R1B2/2Pp4/p3pn2/P2kp3/Q2NpP2/b1R3N1/b5n1

#2

11 + 11

6490 yacpdb 2020
15239 Valois Notebooks 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Qb6
      • 2.Bxb6#
    • 1...Qxd7
      • 2.Bb6#
    • 1...Bc3
      • 2.Qxc3#
    • 1...Bb1
      • 2.Rc4#
    • 1...Bc4
      • 2.Rxc4#
  • Tries
    • 1.Rxd6+?
      • 1...Bd5
        • 2.Rxd5#
      • 1...Sxd6!
    • 1.Qb2+?
      • 1...Kxd3
        • 2.Se1#
      • 1...Bxb2!
    • 1.Qb4+?
      • 1...Kxd3
        • 2.Se1#
        • 2.Qxe4#
      • 1...Bc4
        • 2.Qxc4#
      • 1...axb4!
    • 1.Qc5+?
      • 1...Kxd3
        • 2.Se1#
      • 1...Qxc5!
    • 1.Qxd6+?
      • 1...Bd5
        • 2.Qxd5#
      • 1...Sxd6!
    • 1.Qxa2?
      • threat
        • 2.Qc4#
        • 2.Qd5#
      • 1...Kxd3
        • 2.Qc4#
      • 1...Qa6
        • 2.Qd5#
      • 1...Se7
        • 2.Qc4#
      • 1...d5
        • 2.Rxd5#
        • 2.Qc4#
        • 2.Qxd5#
      • 1...Qc5!
  • Keys
    • 1.Sdf4!
      • 1...Qxd7
        • 2.Bb6#
      • 1...Bxf7
        • 2.Qxa1#
      • 1...Sxf3
        • 2.Se2#
      • 1...exf3
        • 2.Qd3#
      • 1...exf4
        • 2.Bf6#
      • 1...Qc5
        • 2.Qxc5#
      • 1...Qb6
        • 2.Bxb6#
      • 1...Qb8
        • 2.Qc5#
      • 1...Qa6
        • 2.Qc5#
      • 1...Qb7
        • 2.Qc5#
      • 1...Qc7
        • 2.Qc5#
      • 1...Qa8
        • 2.Qc5#
      • 1...Bb2
        • 2.Qxb2#
      • 1...Bc3
        • 2.Qxc3#
      • 1...Bb1
        • 2.Rc4#
        • 2.Qxa1#
      • 1...Bb3
        • 2.Qxa1#
      • 1...Bc4
        • 2.Rxc4#
      • 1...Bd5
        • 2.Qxa1#
      • 1...Be6
        • 2.Qxa1#
      • 1...Se2
        • 2.Sxe2#
      • 1...Sh3
        • 2.Se2#
      • 1...Sg3
        • 2.Qxe3#
      • 1...Sh4
        • 2.Qxe3#
      • 1...Sh6
        • 2.Qxe3#
      • 1...Se7
        • 2.Qxe3#
      • 1...Sg7
        • 2.Qxe3#
      • 1...e2
        • 2.Rd2#
      • 1...d5
        • 2.Se6#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 23
    • REMOVED MATES = 1
  • Sets
    • Q(k);N_GUARD::B(J),XQ(k)
    • Q(k);N_GUARD,N_SPINP(j),XR(H)::B(J)
    • B(a);N_GUARD::QAB1(C),XB(a)
    • B(c);N_GUARD::R1(A)
    • B(c);N_GUARD::R1(A),XB(c)
  • Tries
    • Try
      • R(H);CHECK,XP(j)
      • Vars
        • B(c);N_GUARD,P_SPINB(c)::R1(H),XB(c)
      • Refutation
        • S(i);XR(H)
    • Try
      • Q(C);CHECK
      • Vars
        • K(e);P-FLIGHT,XS(D)::S(B)
      • Refutation
        • B(a);XQ(C)
    • Try
      • Q(C);CHECK
      • Vars
        • B(c);N_GUARD,P_SPINB(c)::QAR1(C),XB(c)
      • Refutation
        • P(g);XQ(C)
    • Try
      • Q(C);CHECK
      • Vars
        • K(e);P-FLIGHT,XS(D)::S(B)
      • Refutation
        • Q(k);XQ(C)
    • Try
      • Q(C);CHECK,XP(j)
      • Vars
        • B(c);N_GUARD,P_SPINB(c)::QAR1(C),XB(c)
      • Refutation
        • S(i);P_SPINS(i),XQ(C)
    • Try
      • Q(C);XB(c)
      • Threat
        • DUALS(2)
      • Vars
        • K(e);P-FLIGHT,XS(D)::QAB1(C)
        • Q(k);::QAR1(C)
        • S(i);::QAR1(C)
      • Refutation
        • Q(k);
  • Actual
    • S(D);
    • Vars
      • Q(k);N_GUARD,N_SPINP(j),XR(H)::B(J)
      • B(c);OGATE,XB(I)::QAB(C),XB(a)
      • S(b);N_GUARD,XP(E)::S(D)
      • P(f);N_GUARD,XP(E)::QAR1(C)
      • P(h);OGATEB,XS(D)::B(J)
      • Q(k);N_GUARD::QAB1(C),XQ(k)
      • Q(k);N_GUARD::B(J),XQ(k)
      • Q(k);N_GUARD,P_PINB(J)::QAB1(C)
      • Q(k);N_GUARD::QAB1(C)
      • B(a);N_GUARD::QAB(C),XB(a)
      • B(a);N_GUARD::QAB1(C),XB(a)
      • B(c);OGATE::QAB(C),XB(a)
      • B(c);N_GUARD::R1(A),XB(c)
      • B(c);N_SPINP(j),OGATE::QAB(C),XB(a)
      • S(b);N_GUARD::S(D),XS(b)
      • S(b);N_GUARD::S(D)
      • S(i);N_GUARD::QAB1(C),XP(d)
      • P(d);N_GUARD::R(A)
      • P(j);S_CUTB(c)::S(D)
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