MESON Chess Problem Database

Problem Display
PID: 169981 (4k3/8/1b2P3/5N2/4Q3/5K2/8/8 w - - 0 1)

Lincoln, Robert A

StrateGems, 2017

4k3/8/1b2P3/5N2/4Q3/5K2/8/8

#2

4 + 2

5454 Near Snap 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Bg1
      • 2.Qa8#
    • 1...Bf2
      • 2.Qa8#
    • 1...Be3
      • 2.Qa8#
    • 1...Bd4
      • 2.Qa8#
    • 1...Bc5
      • 2.Qa8#
  • Tries
    • 1.Qc6+?
      • 1...Kd8
        • 2.Qd7#
        • 2.e7#
      • 1...Kf8!
    • 1.Qb7?
      • threat
        • 2.Qe7#
      • 1...Kd8
        • 2.Qd7#
        • 2.Qb8#
      • 1...Kf8
        • 2.Qf7#
      • 1...Bc5
        • 2.Qa8#
        • 2.Qc8#
        • 2.Qb8#
      • 1...Bd8
        • 2.Qf7#
      • 1...Bc7!
    • 1.Qa4+?
      • 1...Kd8
        • 2.Qd7#
      • 1...Kf8!
    • 1.Qb4?
      • threat
        • 2.Qe7#
      • 1...Bc5
        • 2.Qb8#
      • 1...Bd8
        • 2.Sg7#
      • 1...Kd8!
    • 1.Qh4?
      • threat
        • 2.Qe7#
        • 2.Qh8#
      • 1...Kf8
        • 2.Qh8#
      • 1...Bd4
        • 2.Qe7#
      • 1...Bd8
        • 2.Qh8#
      • 1...Bc5!
  • Keys
    • 1.Qe5!
      • threat
        • 2.Qh8#
      • 1...Kd8
        • 2.Qb8#
      • 1...Kf8
        • 2.Qh8#
      • 1...Bd4
        • 2.Qb8#
      • 1...Bc5
        • 2.Qb8#

Anticipated by 47227(1849), 110515(1870), 183106(1907), 193729(1916), 166257(1917), 149134(1929), 172254(1996), 173962(2005)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 2
    • REMOVED MATES = 3
  • Sets
    • B(a);N_GUARD::QAR(B)
  • Tries
    • Try
      • Q(B);CHECK
      • Refutation
        • K(b);P-FLIGHT
    • Try
      • Q(B);
      • Threat
        • QAR1(B)
      • Vars
        • K(b);P-FLIGHT::QAR1(B)
        • B(a);SBLOCK::QAB1(B)
      • Refutation
        • B(a);
    • Try
      • Q(B);CHECK
      • Vars
        • K(b);P-FLIGHT::QAR1(B)
      • Refutation
        • K(b);P-FLIGHT
    • Try
      • Q(B);
      • Threat
        • QAR1(B)
      • Vars
        • B(a);OGATE::QAR(B)
        • B(a);SBLOCK::S(C)
      • Refutation
        • K(b);P-FLIGHT
    • Try
      • Q(B);
      • Threat
        • DUALS(2)
      • Vars
        • K(b);P-FLIGHT::QAR2(B)
        • B(a);::QAR1(B)
        • B(a);SBLOCK::QAR(B)
      • Refutation
        • B(a);
  • Actual
    • Q(B);
    • Threat
      • QAR(B)
    • Vars
      • K(b);P-FLIGHT::QAR2(B)
      • B(a);N_GUARD::QAR(B)
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