MESON Chess Problem Database

Problem Display
PID: 588 (8/8/4B1K1/8/N5R1/k7/P1Q5/1q2N3 w - - 0 1)

Lipton, Michael

1st HM., The Observer, 1966

8/8/4B1K1/8/N5R1/k7/P1Q5/1q2N3

#2

7 + 2

15085 Australian Chess Forum 1996

SOLUTION

  • SOUND
  • Sets
    • 1...Qxa2
      • 2.Qxa2#
      • 2.Qc5#
    • 1...Qxc2+
      • 2.Sxc2#
    • 1...Qa1
      • 2.Qb3#
      • 2.Qc5#
    • 1...Qc1
      • 2.Qb3#
      • 2.Qxc1#
    • 1...Qd1
      • 2.Qb2#
      • 2.Qc5#
    • 1...Qxe1
      • 2.Qb3#
      • 2.Qb2#
    • 1...Qb2
      • 2.Qxb2#
    • 1...Qb3
      • 2.Qxb3#
  • Tries
    • 1.Rg3+?
      • 1...Qb3
        • 2.Qxb3#
      • 1...Kb4!
    • 1.Qd3+?
      • 1...Qb3
        • 2.Qxb3#
      • 1...Qxd3+!
  • Keys
    • 1.Bb3!
      • 1...Qxc2+
        • 2.Sxc2#
      • 1...Qxa2
        • 2.Qxa2#
      • 1...Qxe1
        • 2.Qb2#
      • 1...Qxb3
        • 2.Qxb3#
      • 1...Qa1
        • 2.Qc5#
      • 1...Qc1
        • 2.Qxc1#
      • 1...Qd1
        • 2.Qb2#
        • 2.Qc5#
      • 1...Qb2
        • 2.Qxb2#
        • 2.Qc5#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 1
  • Sets
    • Q(a);CHECK,XQ(C)::S(A),XQ(a)
    • Q(a);N_PINQ(C)::QAB1(C),XQ(a)
    • Q(a);N_PINQ(C)::QAR1(C),XQ(a)
  • Tries
    • Try
      • R(E);CHECK
      • Vars
        • Q(a);N_PINQ(C),P_SPINQ(a)::QAR1(C),XQ(a)
      • Refutation
        • K(b);S_FLIGHT
    • Try
      • Q(C);CHECK
      • Vars
        • Q(a);N_PINQ(C),P_SPINQ(a)::QAR1(C),XQ(a)
      • Refutation
        • Q(a);CHECK,XQ(C)
  • Actual
    • B(F);
    • Vars
      • Q(a);CHECK,XQ(C)::S(A),XQ(a)
      • Q(a);N_PINQ(C),XP(B)::QAR1(C),XQ(a)
      • Q(a);N_PINQ(C),XS(A)::QAB1(C)
      • Q(a);N_PINQ(C),XB(F)::QAR1(C),XQ(a)
      • Q(a);N_PINQ(C)::QAB(C)
      • Q(a);N_PINQ(C)::QAB(C),XQ(a)
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