MESON Chess Problem Database

Problem Display
PID: 23572 (4Q3/8/2K3pr/7k/8/6R1/7n/8 w - - 0 1)

Lincoln, Robert A

More Fun with Chess Miniatures, 2000

4Q3/8/2K3pr/7k/8/6R1/7n/8

#2

3 + 4

5454 Near Snap 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Rh8
      • 2.Qxh8#
  • Tries
    • 1.Qd7?
      • threat
        • 2.Qh3#
      • 1...Kh4
        • 2.Qh3#
      • 1...Sg4
        • 2.Qxg4#
      • 1...Sf3
        • 2.Qg4#
      • 1...g5+!
    • 1.Qe2+?
      • 1...Kh4
        • 2.Qxh2#
      • 1...Sg4
        • 2.Qxg4#
      • 1...Sf3!
    • 1.Qe5+?
      • 1...Kh4
        • 2.Qg5#
      • 1...g5+!
    • 1.Qc8?
      • threat
        • 2.Qh3#
      • 1...Kh4
        • 2.Qh3#
      • 1...Sg4
        • 2.Qxg4#
      • 1...Sf3
        • 2.Qg4#
      • 1...g5+!
  • Keys
    • 1.Qe6!
      • threat
        • 2.Qh3#
      • 1...Kh4
        • 2.Qh3#
      • 1...Sg4
        • 2.Qxg4#
      • 1...Sf3
        • 2.Qg4#
      • 1...g5
        • 2.Rh3#

Anticipated by 15908(1989)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 1
  • Sets
    • R(d);OGATEB::QAR(C),XR(d)
  • Tries
    • Try
      • Q(C);N_PINP(c)
      • Threat
        • QAR2(C)
      • Vars
        • K(b);P-FLIGHT::QAR1(C)
        • S(a);N_GUARD::QAB1(C),XS(a)
        • S(a);N_GUARD::QAB1(C)
      • Refutation
        • P(c);CHECK
    • Try
      • Q(C);CHECK,N_PINP(c)
      • Vars
        • K(b);P-FLIGHT::QAR2(C),XS(a)
        • S(a);N_GUARD,P_SPINS(a)::QAB1(C),XS(a)
      • Refutation
        • S(a);P_SPINS(a)
    • Try
      • Q(C);CHECK,N_PINP(c)
      • Vars
        • K(b);P-FLIGHT::QAB1(C)
      • Refutation
        • P(c);CHECK,P_SPINP(c)
    • Try
      • Q(C);N_PINP(c)
      • Threat
        • QAR2(C)
      • Vars
        • K(b);P-FLIGHT::QAR1(C)
        • S(a);N_GUARD::QAB1(C),XS(a)
        • S(a);N_GUARD::QAB1(C)
      • Refutation
        • P(c);CHECK
  • Actual
    • Q(C);N_PINP(c)
    • Threat
      • QAR2(C)
    • Vars
      • K(b);P-FLIGHT::QAR1(C)
      • S(a);N_GUARD::QAB1(C),XS(a)
      • S(a);N_GUARD::QAB1(C)
      • P(c);P_PINQ(C),SBLOCK::R(A)
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