MESON Chess Problem Database

Problem Display
PID: 157645 (2K5/8/2Q5/k7/P7/B1n5/7p/8 w - - 0 1)

Lincoln, Robert A

The Problemist, 2015

2K5/8/2Q5/k7/P7/B1n5/7p/8

#2

4 + 3

5454 Near Snap 2015

SOLUTION

  • SOUND
  • Sets
    • 1...Sb1
      • 2.Qb5#
    • 1...Sd1
      • 2.Qb5#
    • 1...Sa2
      • 2.Qb5#
    • 1...Se2
      • 2.Qb5#
    • 1...Se4
      • 2.Qb5#
    • 1...Sb5
      • 2.Qxb5#
    • 1...Sd5
      • 2.Qb5#
  • Tries
    • 1.Qc5+?
      • 1...Kxa4
        • 2.Qb4#
      • 1...Sb5
        • 2.Qxb5#
      • 1...Ka6!
    • 1.Qb6+?
      • 1...Kxa4
        • 2.Qb4#
      • 1...Kxb6!
  • Keys
    • 1.Qb7!
      • threat
        • 2.Qa7#
      • 1...Kxa4
        • 2.Qb4#
      • 1...Sxa4
        • 2.Bb4#
      • 1...Sb5
        • 2.Qxb5#

Anticipated by 9626(1907), 203502(1924)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 6
  • Sets
    • S(b);N_GUARD::QAR1(C)
    • S(b);N_GUARD::QAR1(C),XS(b)
  • Tries
    • Try
      • Q(C);CHECK
      • Vars
        • K(c);P-FLIGHT,XP(B)::QAR1(C)
        • S(b);N_GUARD,P_SPINS(b)::QAR1(C),XS(b)
      • Refutation
        • K(c);P-FLIGHT
    • Try
      • Q(C);CHECK
      • Vars
        • K(c);P-FLIGHT,XP(B)::QAR1(C)
      • Refutation
        • K(c);S_FLIGHT,XQ(C)
  • Actual
    • Q(C);
    • Threat
      • QAR2(C)
    • Vars
      • K(c);P-FLIGHT,XP(B)::QAR1(C)
      • S(b);SBLOCK,XP(B)::B(A)
      • S(b);N_GUARD::QAR1(C),XS(b)
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