MESON Chess Problem Database

Problem Display
PID: 40418 (8/6Q1/8/8/8/8/k1K5/2b5 w - - 0 1)

Rubens, Nathan

The Problemist, 1966

8/6Q1/8/8/8/8/k1K5/2b5

#2

2 + 2

136 Problem Observer 2001
3713 Snap 2019

SOLUTION

  • SOUND
  • Sets
    • 1...Bb2
      • 2.Qxb2#
    • 1...Bd2
      • 2.Qb2#
    • 1...Be3
      • 2.Qb2#
    • 1...Bf4
      • 2.Qb2#
      • 2.Qa7#
    • 1...Bg5
      • 2.Qb2#
      • 2.Qa7#
    • 1...Bh6
      • 2.Qb2#
      • 2.Qa7#
  • Tries
    • 1.Qc3?
      • 1...Bb2
        • 2.Qxb2#
      • 1...Bd2
        • 2.Qb2#
      • 1...Be3
        • 2.Qb2#
        • 2.Qa5#
      • 1...Bf4
        • 2.Qb2#
        • 2.Qa5#
      • 1...Bg5
        • 2.Qb2#
        • 2.Qa5#
      • 1...Bh6
        • 2.Qb2#
        • 2.Qa5#
      • 1...Ba3!
    • 1.Qe5?
      • 1...Ka3
        • 2.Qa5#
      • 1...Bb2
        • 2.Qxb2#
      • 1...Bd2
        • 2.Qb2#
      • 1...Be3
        • 2.Qb2#
        • 2.Qa5#
      • 1...Bf4
        • 2.Qb2#
        • 2.Qa5#
      • 1...Bg5
        • 2.Qb2#
        • 2.Qa5#
      • 1...Bh6
        • 2.Qb2#
        • 2.Qa5#
      • 1...Ba3!
    • 1.Qf7+?
      • 1...Ka3
        • 2.Qb3#
      • 1...Ka1!
    • 1.Qg8+?
      • 1...Ka3
        • 2.Qb3#
      • 1...Ka1!
  • Keys
    • 1.Qb7!
      • 1...Ka1
        • 2.Qb1#
      • 1...Ka3
        • 2.Qb3#
      • 1...Ba3
        • 2.Qb1#
      • 1...Bb2
        • 2.Qxb2#
      • 1...Bd2
        • 2.Qb2#
      • 1...Be3
        • 2.Qa6#
        • 2.Qb2#
      • 1...Bf4
        • 2.Qa6#
        • 2.Qa8#
        • 2.Qb2#
        • 2.Qa7#
      • 1...Bg5
        • 2.Qa6#
        • 2.Qa8#
        • 2.Qb2#
        • 2.Qa7#
      • 1...Bh6
        • 2.Qa6#
        • 2.Qa8#
        • 2.Qb2#
        • 2.Qa7#

Anticipated by 189963(1913)

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 1
  • Sets
    • B(a);N_GUARD::QAR1(B),XB(a)
    • B(a);N_GUARD::QAR1(B)
  • Tries
    • Try
      • Q(B);
      • Vars
        • B(a);N_GUARD::QAR1(B),XB(a)
        • B(a);N_GUARD::QAR1(B)
      • Refutation
        • B(a);
    • Try
      • Q(B);
      • Vars
        • K(b);P-FLIGHT::QAR2(B)
        • B(a);N_GUARD::QAR1(B),XB(a)
        • B(a);N_GUARD::QAR1(B)
      • Refutation
        • B(a);
    • Try
      • Q(B);CHECK
      • Vars
        • K(b);P-FLIGHT::QAR1(B)
      • Refutation
        • K(b);P-FLIGHT
    • Try
      • Q(B);CHECK
      • Vars
        • K(b);P-FLIGHT::QAR1(B)
      • Refutation
        • K(b);P-FLIGHT
  • Actual
    • Q(B);
    • Vars
      • K(b);P-FLIGHT::QAR1(B)
      • B(a);SBLOCK::QAB1(B)
      • B(a);N_GUARD::QAR1(B),XB(a)
      • B(a);N_GUARD::QAR1(B)
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