MESON Chess Problem Database

Problem Display
PID: 212384 (8/5N2/4B3/8/4kp2/8/3KN1R1/8 w - - 0 1)

Love, Stephen

The Problemist, 1986

8/5N2/4B3/8/4kp2/8/3KN1R1/8

#2

5 + 2

3713 Snap 2020
5454 Near Snap 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Kf3
      • 2.Bd5#
    • 1...f3
      • 2.Rg4#
  • Tries
    • 1.Sc1?
      • 1...Kf3
        • 2.Bd5#
      • 1...f3
        • 2.Rg4#
      • 1...Kd4!
    • 1.Sg1?
      • 1...f3
        • 2.Rg4#
      • 1...Kd4!
    • 1.Sc3+?
      • 1...Kf3
        • 2.Bd5#
      • 1...Kd4!
    • 1.Sd4?
      • 1...f3
        • 2.Rg4#
      • 1...Kxd4!
    • 1.Sd6+?
      • 1...Kf3
        • 2.Bd5#
      • 1...Ke5!
    • 1.Rg1?
      • 1...f3
        • 2.Rg4#
      • 1...Kf3!
    • 1.Rg3?
      • 1...f3
        • 2.Rg4#
      • 1...fxg3!
    • 1.Rg6?
      • 1...f3
        • 2.Rg4#
      • 1...Kf3!
    • 1.Rg7?
      • 1...f3
        • 2.Rg4#
      • 1...Kf3!
    • 1.Rg8?
      • 1...f3
        • 2.Rg4#
      • 1...Kf3!
  • Keys
    • 1.Rh2!
      • 1...Kf3
        • 2.Sg5#
      • 1...f3
        • 2.Rh4#

Anticipated by 6541(1931), 23548(1969)

FEATURES

  • Static
    • TYPE = MUTATE
    • CHANGED MATES = 2
    • ADDED MATES = 0
    • REMOVED MATES = 0
  • Sets
    • K(a);S_FLIGHT::B(D)
    • P(b);OGATEB,SBLOCK::R(C)
  • Tries
    • Try
      • S(B);
      • Vars
        • K(a);S_FLIGHT::B(D)
        • P(b);OGATEB,SBLOCK::R(C)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • S(B);
      • Vars
        • P(b);OGATEB::R(C)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • S(B);CHECK
      • Vars
        • K(a);S_FLIGHT::B(D)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • S(B);
      • Vars
        • P(b);OGATEB::R(C)
      • Refutation
        • K(a);P-FLIGHT,XS(B)
    • Try
      • S(E);CHECK
      • Vars
        • K(a);S_FLIGHT::B(D)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • R(C);
      • Vars
        • P(b);OGATEB,SBLOCK::R(C)
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • R(C);
      • Vars
        • P(b);OGATEB,SBLOCK::R(C)
      • Refutation
        • P(b);XR(C)
    • Try
      • R(C);
      • Vars
        • P(b);OGATEB,SBLOCK::R(C)
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • R(C);
      • Vars
        • P(b);OGATEB,SBLOCK::R(C)
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • R(C);
      • Vars
        • P(b);OGATEB,SBLOCK::R(C)
      • Refutation
        • K(a);S_FLIGHT
  • Actual
    • R(C);
    • Vars
      • K(a);S_FLIGHT::S(E)
      • P(b);OGATEB,SBLOCK::R(C)
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