MESON Chess Problem Database

Problem Display
PID: 234618 (4QNb1/7p/8/8/4N2k/5K2/8/8 w - - 0 1)

Lincoln, Robert A

Kudesnik, 2003

4QNb1/7p/8/8/4N2k/5K2/8/8

#2

4 + 3

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Kh3
      • 2.Qh5#
  • Tries
    • 1.Qg6?
      • threat
        • 2.Qg4#
        • 2.Qh6#
      • 1...Kh3
        • 2.Qh5#
        • 2.Qg3#
        • 2.Qh6#
      • 1...Be6
        • 2.Qxh7#
        • 2.Qh6#
      • 1...Bf7
        • 2.Qg4#
      • 1...h5
        • 2.Qg3#
      • 1...h6
        • 2.Qg4#
        • 2.Qxh6#
      • 1...hxg6!
    • 1.Qe5?
      • threat
        • 2.Qh2#
      • 1...Kh3
        • 2.Qg3#
        • 2.Qh5#
      • 1...Be6!
    • 1.Qe6?
      • threat
        • 2.Qg4#
        • 2.Qh6#
      • 1...Kh5
        • 2.Qh3#
      • 1...Bf7
        • 2.Qg4#
      • 1...h5
        • 2.Sg6#
      • 1...h6
        • 2.Qg4#
        • 2.Qxh6#
      • 1...Bxe6!
    • 1.Qe7+?
      • 1...Kh5
        • 2.Qg5#
      • 1...Kh3!
    • 1.Qb8?
      • threat
        • 2.Qh2#
      • 1...Kh3
        • 2.Qg3#
      • 1...Kh5
        • 2.Qh2#
      • 1...Be6!
    • 1.Qc8?
      • threat
        • 2.Qg4#
      • 1...Kh5
        • 2.Qh3#
      • 1...h5
        • 2.Sg6#
      • 1...Be6!
    • 1.Qd8+?
      • 1...Kh5
        • 2.Qg5#
      • 1...Kh3!
  • Keys
    • 1.Qd7!
      • threat
        • 2.Qg4#
      • 1...Kh5
        • 2.Qh3#
      • 1...Be6
        • 2.Qxh7#
      • 1...h5
        • 2.Sg6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 1
  • Sets
    • K(a);P-FLIGHT::QAR2(C)
  • Tries
    • Try
      • Q(C);
      • Threat
        • DUALS(2)
      • Vars
        • B(c);::QAR1(C)
        • P(b);SBLOCK::QAB1(C)
      • Refutation
        • P(b);XQ(C)
    • Try
      • Q(C);
      • Threat
        • QAR2(C)
      • Refutation
        • B(c);
    • Try
      • Q(C);
      • Threat
        • DUALS(2)
      • Vars
        • K(a);P-FLIGHT::QAR2(C)
        • B(c);::QAR1(C)
        • P(b);N_GUARD,SBLOCK::S(D)
      • Refutation
        • B(c);XQ(C)
    • Try
      • Q(C);CHECK
      • Vars
        • K(a);P-FLIGHT::QAR1(C)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • Q(C);
      • Threat
        • QAR2(C)
      • Vars
        • K(a);P-FLIGHT::QAR1(C)
        • K(a);P-FLIGHT::QAR(C)
      • Refutation
        • B(c);
    • Try
      • Q(C);
      • Threat
        • QAR1(C)
      • Vars
        • K(a);P-FLIGHT::QAR2(C)
        • P(b);N_GUARD,SBLOCK::S(D)
      • Refutation
        • B(c);
    • Try
      • Q(C);CHECK
      • Vars
        • K(a);P-FLIGHT::QAR1(C)
      • Refutation
        • K(a);P-FLIGHT
  • Actual
    • Q(C);
    • Threat
      • QAR1(C)
    • Vars
      • K(a);P-FLIGHT::QAR2(C)
      • B(c);N_GUARD::QAR(C),XP(b)
      • P(b);N_GUARD,SBLOCK::S(D)
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