MESON Chess Problem Database

Problem Display
PID: 134747 (8/8/3P4/1P1Q4/p7/k1K1N3/8/rb6 w - - 0 1)

Lawson, M

The Field, 1966

(First published on Thu Jul 7 1966)

8/8/3P4/1P1Q4/p7/k1K1N3/8/rb6

#2

5 + 4

SOLUTION

  • SOUND
  • Sets
    • 1...Ra2
      • 2.Sc4#
      • 2.Qc5#
    • 1...Ba2
      • 2.Sc2#
      • 2.Qc5#
    • 1...Bc2
      • 2.Sxc2#
  • Tries
    • 1.Qh1?
      • 1...Bc2
        • 2.Qxa1#
      • 1...Ra2
        • 2.Sc4#
      • 1...Ba2
        • 2.Sc2#
      • 1...Bd3
        • 2.Qxa1#
      • 1...Be4
        • 2.Qxa1#
      • 1...Bf5
        • 2.Qxa1#
      • 1...Bg6
        • 2.Qxa1#
      • 1...Bh7
        • 2.Qxa1#
      • 1...Ka2!
    • 1.Qa2+?
      • 1...Rxa2
        • 2.Sc4#
      • 1...Bxa2
        • 2.Sc2#
      • 1...Kxa2!
    • 1.Qg2?
      • threat
        • 2.Sc4#
        • 2.Qb2#
      • 1...Ra2
        • 2.Sc4#
      • 1...Ba2
        • 2.Sc2#
        • 2.Qb2#
      • 1...Bd3
        • 2.Qb2#
      • 1...Bc2!
    • 1.Qd2?
      • threat
        • 2.Sc4#
        • 2.Qb2#
      • 1...Ra2
        • 2.Sc4#
      • 1...Ba2
        • 2.Sc2#
        • 2.Qb2#
      • 1...Bd3
        • 2.Qb2#
      • 1...Bc2!
  • Keys
    • 1.Qd1!
      • 1...Ka2
        • 2.Qxa4#
      • 1...Bc2
        • 2.Qxa1#
      • 1...Ra2
        • 2.Sc4#
      • 1...Ba2
        • 2.Sc2#
      • 1...Bd3
        • 2.Qxa1#
      • 1...Be4
        • 2.Qxa1#
      • 1...Bf5
        • 2.Qxa1#
      • 1...Bg6
        • 2.Qxa1#
      • 1...Bh7
        • 2.Qxa1#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 1
    • ADDED MATES = 8
    • REMOVED MATES = 0
  • Sets
    • B(b);N_GUARD::S(B),XB(b)
  • Tries
    • Try
      • Q(D);
      • Vars
        • B(b);OGATE::QAR2(D),XR(a)
        • R(a);SBLOCK::S(B)
        • B(b);N_GUARD,SBLOCK::S(B)
      • Refutation
        • K(c);P-FLIGHT
    • Try
      • Q(D);CHECK
      • Vars
        • R(a);SBLOCK,XQ(D)::S(B)
        • B(b);SBLOCK,XQ(D)::S(B)
      • Refutation
        • K(c);P-FLIGHT,XQ(D)
    • Try
      • Q(D);
      • Threat
        • DUALS(2)
      • Vars
        • R(a);::S(B)
        • B(b);::QAB1(D)
      • Refutation
        • B(b);
    • Try
      • Q(D);
      • Threat
        • DUALS(2)
      • Vars
        • R(a);::S(B)
        • B(b);::QAB1(D)
      • Refutation
        • B(b);
  • Actual
    • Q(D);
    • Vars
      • K(c);P-FLIGHT::QAR2(D),XP(d)
      • B(b);OGATE::QAR2(D),XR(a)
      • R(a);SBLOCK::S(B)
      • B(b);N_GUARD,SBLOCK::S(B)
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