MESON Chess Problem Database

Problem Display
PID: 7379 (8/3B4/5Q2/3r3k/5P2/3b4/7K/8 w - - 0 1)

Lincoln, Robert A

StrateGems, 1999

8/3B4/5Q2/3r3k/5P2/3b4/7K/8

#2

4 + 3

2786 More Fun with Chess Miniatures 2000
5454 Near Snap 2017

SOLUTION

  • SOUND
  • Sets
    • 1...Rd4
      • 2.Qg5#
    • 1...Rg5
      • 2.Qxg5#
    • 1...Rd6
      • 2.Qg5#
    • 1...Rxd7
      • 2.Qg5#
    • 1...Bf5
      • 2.Qg5#
  • Tries
    • 1.Bf5?
      • threat
        • 2.Qg5#
        • 2.Qh8#
      • 1...Bxf5
        • 2.Qg5#
      • 1...Rd6
        • 2.Qg5#
      • 1...Rd7
        • 2.Qg5#
      • 1...Rd8
        • 2.Qg5#
      • 1...Rxf5!
    • 1.Qh8+?
      • 1...Bh7
        • 2.Qxh7#
      • 1...Kg6!
  • Keys
    • 1.Kg3!
      • threat
        • 2.Bg4#
      • 1...Rg5+
        • 2.Qxg5#
      • 1...Rxd7
        • 2.Qg5#
      • 1...Bg6
        • 2.Qh4#
      • 1...Rf5
        • 2.Be8#
      • 1...Be2
        • 2.Be8#
      • 1...Bf5
        • 2.Qg5#

Anticipated by 157927(1983)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 2
  • Sets
    • R(b);N_GUARD::QAR1(C)
    • R(b);N_GUARD::QAR1(C),XR(b)
    • R(b);N_GUARD,XB(D)::QAR1(C)
    • B(a);S_CUTR(b)::QAR1(C)
  • Tries
    • Try
      • B(D);
      • Threat
        • DUALS(2)
      • Vars
        • B(a);XB(D)::QAR1(C)
        • R(b);::QAR1(C)
      • Refutation
        • R(b);XB(D)
    • Try
      • Q(C);CHECK
      • Vars
        • B(a);N_GUARD,P_SPINB(a)::QAR2(C),XB(a)
      • Refutation
        • K(c);S_FLIGHT
  • Actual
    • K(A);S_FLIGHT
    • Threat
      • B(D)
    • Vars
      • R(b);CHECK,N_GUARD::QAR1(C),XR(b)
      • R(b);N_GUARD,XB(D)::QAR1(C)
      • B(a);SBLOCK::QAR1(C)
      • R(b);S_CUTB(a)::B(D)
      • B(a);N_GUARD::B(D)
      • B(a);S_CUTR(b)::QAR1(C)
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