MESON Chess Problem Database

Problem Display
PID: 854 (8/1p6/1N6/1Q6/1pp5/1k6/8/2K5 w - - 0 1)

Lewis, Robert Tony

British Chess Magazine, 1978

8/1p6/1N6/1Q6/1pp5/1k6/8/2K5

#2

3 + 4

3310 2345 Chess Problems 1997
3713 Snap 2003
133 The Problemist Supplement 2008
133 The Problemist Supplement 2011

SOLUTION

  • SOUND
  • Sets
    • 1...Ka2
      • 2.Qa4#
    • 1...Ka3
      • 2.Qa4#
    • 1...Kc3
      • 2.Qxc4#
    • 1...c3
      • 2.Qa4#
  • Tries
    • 1.Kb1?
      • 1...Ka3
        • 2.Qa4#
      • 1...c3
        • 2.Qa4#
      • 1...Kc3!
    • 1.Qa6?
      • 1...Kc3
        • 2.Qxc4#
      • 1...c3
        • 2.Qa4#
      • 1...bxa6!
    • 1.Qc6?
      • 1...Ka2
        • 2.Qa4#
      • 1...Ka3
        • 2.Qa4#
      • 1...Kc3
        • 2.Qxc4#
      • 1...c3
        • 2.Qa4#
      • 1...bxc6!
    • 1.Qd7?
      • 1...Ka2
        • 2.Qa4#
      • 1...Ka3
        • 2.Qa4#
      • 1...c3
        • 2.Qa4#
      • 1...Kc3!
    • 1.Qxb4+?
      • 1...Ka2
        • 2.Qb2#
        • 2.Qa4#
      • 1...Kxb4!
    • 1.Qa5?
      • 1...c3
        • 2.Qa4#
      • 1...Kc3!
    • 1.Qe5?
      • threat
        • 2.Qb2#
      • 1...Ka2
        • 2.Qb2#
      • 1...Ka3
        • 2.Qb2#
      • 1...c3!
  • Keys
    • 1.Qe8!
      • 1...Ka2
        • 2.Qa4#
      • 1...Ka3
        • 2.Qa4#
      • 1...Kc3
        • 2.Qe3#
      • 1...c3
        • 2.Qa4#

This anticipates 47185(1988), 171342(1995)

FEATURES

  • Static
    • TYPE = MUTATE
    • CHANGED MATES = 1
    • ADDED MATES = 0
    • REMOVED MATES = 0
  • Sets
    • K(a);N_SPINP(b),S_FLIGHT::QAR2(B)
    • K(a);N_SPINP(b),P-FLIGHT::QAR1(B)
    • K(a);N_SPINP(b),P-FLIGHT::QAR1(B),XP(c)
    • P(c);SBLOCK::QAB1(B)
  • Tries
    • Try
      • K(A);P-FLIGHT
      • Vars
        • K(a);N_SPINP(b),P-FLIGHT::QAR1(B)
        • P(c);SBLOCK::QAB1(B)
      • Refutation
        • K(a);N_SPINP(b),P-FLIGHT
    • Try
      • Q(B);N_PINP(b)
      • Vars
        • K(a);P-FLIGHT::QAR1(B),XP(c)
        • P(c);SBLOCK::QAB1(B)
      • Refutation
        • P(d);XQ(B)
    • Try
      • Q(B);N_PINP(b)
      • Vars
        • K(a);S_FLIGHT::QAR2(B)
        • K(a);P-FLIGHT::QAR1(B)
        • K(a);P-FLIGHT,P_SPINP(c)::QAR1(B),XP(c)
        • P(c);SBLOCK::QAB1(B)
      • Refutation
        • P(d);XQ(B)
    • Try
      • Q(B);N_PINP(b)
      • Vars
        • K(a);S_FLIGHT::QAR2(B)
        • K(a);P-FLIGHT::QAR1(B)
        • P(c);SBLOCK::QAB1(B)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • Q(B);CHECK,XP(b)
      • Refutation
        • K(a);P-FLIGHT,XQ(B)
    • Try
      • Q(B);N_PINP(b)
      • Vars
        • P(c);SBLOCK::QAB1(B)
      • Refutation
        • K(a);P-FLIGHT,P_SPINP(b)
    • Try
      • Q(B);N_PINP(b)
      • Threat
        • QAR1(B)
      • Vars
        • K(a);S_FLIGHT::QAR1(B)
        • K(a);P-FLIGHT::QAB1(B)
      • Refutation
        • P(c);
  • Actual
    • Q(B);N_PINP(b)
    • Vars
      • K(a);S_FLIGHT::QAR2(B)
      • K(a);P-FLIGHT::QAR1(B)
      • K(a);P-FLIGHT::QAR2(B)
      • P(c);SBLOCK::QAB1(B)
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