MESON Chess Problem Database

Problem Display
PID: 154245 (1b1B4/8/7Q/1pp1pK2/1PBk4/3P1Rp1/7n/Nq1N1n2 w - - 0 1)

Lawton, Howard

Sheffield Guardian (The), 1909

(First published on Fri Nov 19 1909)

1b1B4/8/7Q/1pp1pK2/1PBk4/3P1Rp1/7n/Nq1N1n2

#2

9 + 9

15239 Valois Notebooks 2015

SOLUTION

  • SOUND
  • Sets
    • 1...Qc2
      • 2.Sxc2#
    • 1...Qc1
      • 2.Sb3#
    • 1...Qb3
      • 2.Sxb3#
    • 1...Qxb4
      • 2.Sc2#
    • 1...Bd6
      • 2.Qxd6#
    • 1...Ba7
      • 2.Qd6#
    • 1...Sd2
      • 2.Qe3#
    • 1...Se3+
      • 2.Qxe3#
    • 1...cxb4
      • 2.Bb6#
      • 2.Qb6#
  • Tries
    • 1.Rf4+?
      • 1...e4
        • 2.Rxe4#
      • 1...exf4!
    • 1.Qf4+?
      • 1...e4
        • 2.Qxe4#
      • 1...exf4!
    • 1.Qh4+?
      • 1...e4
        • 2.Qxe4#
      • 1...Sg4!
  • Keys
    • 1.Qc1!
      • threat
        • 2.Qc3#
      • 1...Qxd3+
        • 2.Rxd3#
      • 1...Se3+
        • 2.Qxe3#
      • 1...Qxa1
        • 2.Qxa1#
      • 1...Qxc1
        • 2.Sb3#
      • 1...Qxb4
        • 2.Sc2#
      • 1...bxc4
        • 2.Qxc4#
      • 1...cxb4
        • 2.Bb6#
      • 1...Qc2
        • 2.Sxc2#
      • 1...Qb2
        • 2.Qxb2#
      • 1...Qb3
        • 2.Sxb3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 3
  • Sets
    • Q(a);N_GUARD::S(A),XQ(a)
    • Q(a);N_GUARD,N_PINP(C)::S(A)
    • Q(a);N_GUARD,N_PINP(C)::S(A),XQ(a)
    • Q(a);N_GUARD,N_PINP(C),XP(E)::S(A)
    • B(i);N_GUARD::QAR2(H),XB(i)
    • B(i);N_GUARD::QAR2(H)
    • S(b);N_GUARD::QAB1(H)
    • S(b);CHECK,N_GUARD::QAB1(H),XS(b)
  • Tries
    • Try
      • R(D);CHECK
      • Vars
        • P(h);N_PINP(C),P_SPINP(h)::R1(D),XP(h)
      • Refutation
        • P(h);XR(D)
    • Try
      • Q(H);CHECK
      • Vars
        • P(h);N_PINP(C),P_SPINP(h)::QAR1(H),XP(h)
      • Refutation
        • P(h);XQ(H)
    • Try
      • Q(H);CHECK
      • Vars
        • P(h);N_PINP(C),P_SPINP(h)::QAR1(H),XP(h)
      • Refutation
        • S(c);P_SPINS(c)
  • Actual
    • Q(H);
    • Threat
      • QAB1(H)
    • Vars
      • Q(a);CHECK,OGATE,XP(C)::R1(D),XQ(a)
      • S(b);CHECK,N_GUARD::QAB1(H),XS(b)
      • Q(a);N_PINP(C),OGATE,XS(A)::QAB(H),XQ(a)
      • Q(a);N_GUARD,N_PINP(C),XQ(H)::S(A)
      • Q(a);N_GUARD,N_PINP(C),XP(E)::S(A)
      • P(f);OGATE,XB(F)::QAR1(H),XP(f)
      • P(g);OGATEB,XP(E)::B(I)
      • Q(a);N_GUARD::S(A),XQ(a)
      • Q(a);N_GUARD,N_PINP(C)::QAB(H),XQ(a)
      • Q(a);N_GUARD,N_PINP(C)::S(A),XQ(a)
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