MESON Chess Problem Database

Problem Display
PID: 178564 (K7/1pb5/k7/5Q2/8/1N6/5B2/8 w - - 0 1)

Rice, John Michael

Problem Observer, 2010

K7/1pb5/k7/5Q2/8/1N6/5B2/8

#2

4 + 3

5454 Near Snap 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Bh2
      • 2.Qa5#
    • 1...Bg3
      • 2.Qa5#
    • 1...Bf4
      • 2.Qa5#
    • 1...Ba5
      • 2.Qxa5#
    • 1...Bb6
      • 2.Qd3#
    • 1...Bd6
      • 2.Qa5#
    • 1...Bb8
      • 2.Qa5#
    • 1...b5
      • 2.Qc8#
  • Tries
    • 1.Sd4?
      • threat
        • 2.Qb5#
      • 1...Kb6
        • 2.Qb5#
      • 1...b5
        • 2.Qxb5#
      • 1...Be5!
    • 1.Qe4?
      • threat
        • 2.Qxb7#
      • 1...Bb6
        • 2.Qd3#
        • 2.Qe2#
        • 2.Qc4#
      • 1...b5
        • 2.Qb7#
      • 1...b6
        • 2.Qa4#
      • 1...Kb5!
    • 1.Qc8?
      • threat
        • 2.Qxb7#
      • 1...Bb6
        • 2.Qc4#
      • 1...Kb5!
    • 1.Qd5?
      • threat
        • 2.Qxb7#
      • 1...Bb6
        • 2.Qc4#
        • 2.Qd3#
      • 1...b5
        • 2.Qb7#
      • 1...b6!
  • Keys
    • 1.Qd7!
      • 1...Bd8
        • 2.Qxb7#
      • 1...Bh2
        • 2.Qa4#
        • 2.Qxb7#
      • 1...Bg3
        • 2.Qa4#
        • 2.Qxb7#
      • 1...Bf4
        • 2.Qa4#
        • 2.Qxb7#
      • 1...Ba5
        • 2.Qxb7#
      • 1...Be5
        • 2.Qa4#
        • 2.Qxb7#
      • 1...Bb6
        • 2.Qd3#
      • 1...Bd6
        • 2.Qa4#
        • 2.Qxb7#
      • 1...Bb8
        • 2.Qa4#
        • 2.Qxb7#
      • 1...b5
        • 2.Qc8#
      • 1...b6
        • 2.Qa4#

Anticipated by 224113(1940), 23125(1996)

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 1
    • ADDED MATES = 2
    • REMOVED MATES = 5
  • Sets
    • B(c);N_GUARD::QAR1(C)
    • B(c);N_GUARD::QAR1(C),XB(c)
    • B(c);S_CUTP(b)::QAB(C)
    • P(b);OGATEB,SBLOCK::QAB(C)
  • Tries
    • Try
      • S(B);
      • Threat
        • QAB1(C)
      • Vars
        • K(a);P-FLIGHT::QAR1(C)
        • P(b);::QAB1(C),XP(b)
      • Refutation
        • B(c);
    • Try
      • Q(C);
      • Threat
        • QAB1(C),XP(b)
      • Vars
        • P(b);::QAB1(C)
        • P(b);S_CUTB(c)::QAR2(C)
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • Q(C);P_PINP(b)
      • Threat
        • QAB1(C),XP(b)
      • Vars
        • B(c);OGATE::QAB(C)
      • Refutation
        • K(a);N_SPINP(b),S_FLIGHT
    • Try
      • Q(C);
      • Threat
        • QAB1(C),XP(b)
      • Vars
        • P(b);::QAB1(C)
      • Refutation
        • P(b);
  • Actual
    • Q(C);
    • Vars
      • B(c);OGATE::QAB1(C),XP(b)
      • B(c);S_CUTP(b)::QAB(C)
      • P(b);OGATEB,SBLOCK::QAB(C)
      • P(b);S_CUTB(c)::QAR2(C)
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