MESON Chess Problem Database

Problem Display
PID: 217600 (Q7/2nb4/2n2N2/3Rp3/1Bk1p3/1pP4B/2R3p1/6K1 w - - 0 1)

Collins, Francis Charles

English Mechanic and World of Science, 1873

(First published on Fri Mar 14 1873)

Q7/2nb4/2n2N2/3Rp3/1Bk1p3/1pP4B/2R3p1/6K1

#2

8 + 8

15239 Valois Notebooks 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Bxh3
      • 2.Qxc6#
    • 1...Bg4
      • 2.Qxc6#
    • 1...Bf5
      • 2.Qxc6#
    • 1...Be6
      • 2.Qxc6#
    • 1...Bc8
      • 2.Qxc6#
    • 1...Sxd5
      • 2.Qa6#
    • 1...Sa6
      • 2.Qxa6#
    • 1...Se6
      • 2.Qa6#
    • 1...Se8
      • 2.Qa6#
    • 1...bxc2
      • 2.Qa2#
    • 1...b2
      • 2.Qa2#
  • Tries
    • 1.Sxd7?
      • threat
        • 2.Sb6#
        • 2.Qxc6#
      • 1...Kxd5
        • 2.Sb6#
      • 1...Sxb4
        • 2.Sxe5#
        • 2.Sb6#
      • 1...Sxd5
        • 2.Qa6#
      • 1...bxc2
        • 2.Qa2#
      • 1...b2
        • 2.Qa2#
      • 1...Sd4
        • 2.Sxe5#
      • 1...Sa5
        • 2.Sxe5#
        • 2.Sb6#
      • 1...Sa7
        • 2.Sxe5#
        • 2.Sb6#
      • 1...Se7
        • 2.Sxe5#
        • 2.Sb6#
      • 1...Sb8
        • 2.Sxe5#
        • 2.Sb6#
      • 1...Sd8
        • 2.Sxe5#
        • 2.Sb6#
      • 1...Sa6
        • 2.Sb6#
      • 1...Se6
        • 2.Sb6#
      • 1...Sxa8!
    • 1.Rcd2?
      • threat
        • 2.Rc5#
      • 1...Sxd5
        • 2.Qa6#
      • 1...b2
        • 2.Qa2#
      • 1...Sa6
        • 2.Qxa6#
      • 1...Se6
        • 2.Qa6#
      • 1...Sxb4!
    • 1.Qa6+?
      • 1...Sb5
        • 2.Qxb5#
      • 1...Sxa6!
  • Keys
    • 1.Sg4!
      • threat
        • 2.Se3#
      • 1...Kxd5
        • 2.Se3#
      • 1...Bxg4
        • 2.Qxc6#
      • 1...Sxd5
        • 2.Qa6#
      • 1...bxc2
        • 2.Qa2#
      • 1...b2
        • 2.Qa2#
      • 1...Sd4
        • 2.Sxe5#
      • 1...e3
        • 2.Sxe3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 7
  • Sets
    • B(h);N_GUARD,XB(D)::QAR2(H),XS(f)
    • B(h);N_GUARD::QAR2(H),XS(f)
    • S(g);N_GUARD,XR(F)::QAB(H)
    • S(g);N_GUARD::QAB(H),XS(g)
    • S(g);N_GUARD::QAB(H)
    • P(b);OGATEB,XR(B)::QAB(H)
    • P(b);OGATEB::QAB(H)
  • Tries
    • Try
      • S(G);XB(h)
      • Threat
        • DUALS(2)
      • Vars
        • K(c);P_SPINS(f),S_FLIGHT,XR(F)::S(G)
        • S(g);N_GUARD,SBLOCK,XR(F)::QAB(H)
        • P(b);OGATEB,XR(B)::QAB(H)
        • P(b);OGATEB::QAB(H)
        • S(f);N_GUARD::S(G),XP(e)
        • S(g);::S(G)
      • Refutation
        • S(g);XQ(H)
    • Try
      • R(B);
      • Threat
        • R1(F)
      • Vars
        • S(g);N_GUARD,XR(F)::QAB(H)
        • P(b);OGATEB::QAB(H)
        • S(g);N_GUARD::QAB(H),XS(g)
        • S(g);N_GUARD::QAB(H)
      • Refutation
        • S(f);XB(E)
    • Try
      • Q(H);CHECK
      • Vars
        • S(g);N_GUARD,P_SPINS(g)::QAB1(H),XS(g)
      • Refutation
        • S(g);XQ(H)
  • Actual
    • S(G);
    • Threat
      • S(G)
    • Vars
      • K(c);P_SPINS(f),S_FLIGHT,XR(F)::S(G)
      • B(h);N_GUARD,XS(G)::QAR2(H),XS(f)
      • S(g);N_GUARD,SBLOCK,XR(F)::QAB(H)
      • P(b);OGATEB,XR(B)::QAB(H)
      • P(b);OGATEB::QAB(H)
      • S(f);N_GUARD::S(G),XP(e)
      • P(d);::S(G),XP(d)
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