MESON Chess Problem Database

Problem Display
PID: 9524 (4B3/2p5/N2P4/3kP2R/6Q1/8/2PnP3/7K w - - 0 1)

Mackenzie, Arthur Ford

Chess Lyrics, 1905

4B3/2p5/N2P4/3kP2R/6Q1/8/2PnP3/7K

#2

9 + 3

5454 Near Snap 2017

SOLUTION

  • SOUND
  • Sets
    • 1...Sb1
      • 2.c4#
    • 1...Sf1
      • 2.c4#
    • 1...Sb3
      • 2.c4#
    • 1...Sf3
      • 2.c4#
    • 1...cxd6
      • 2.e6#
    • 1...c5
      • 2.Sc7#
    • 1...c6
      • 2.Bf7#
  • Tries
    • 1.Qa4?
      • threat
        • 2.Bf7#
      • 1...Ke6
        • 2.Sxc7#
      • 1...Sc4!
    • 1.Qb4?
      • threat
        • 2.Sxc7#
      • 1...Ke6
        • 2.Sxc7#
      • 1...cxd6
        • 2.Sc7#
      • 1...c5
        • 2.Sc7#
      • 1...c6
        • 2.Sc7#
        • 2.Bf7#
      • 1...Sc4!
    • 1.Qd4+?
      • 1...Ke6
        • 2.Sc5#
        • 2.Sxc7#
      • 1...Kxd4!
    • 1.e3?
      • 1...cxd6
        • 2.e6#
      • 1...Se4
        • 2.Qg8#
      • 1...Sb1
        • 2.c4#
      • 1...Sf1
        • 2.c4#
      • 1...Sb3
        • 2.c4#
      • 1...Sf3
        • 2.c4#
      • 1...c5
        • 2.Sc7#
      • 1...c6
        • 2.Bf7#
      • 1...Sc4!
  • Keys
    • 1.c3!
      • 1...cxd6
        • 2.e6#
      • 1...Se4
        • 2.Qg8#
      • 1...Sc4
        • 2.e4#
      • 1...Sb1
        • 2.c4#
      • 1...Sf1
        • 2.c4#
      • 1...Sb3
        • 2.c4#
      • 1...Sf3
        • 2.c4#
      • 1...c5
        • 2.Sc7#
      • 1...c6
        • 2.Bf7#

This anticipates 24689(1987)

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • S(a);N_GUARD::P(B)
    • P(c);SBLOCK,XP(H)::R(F)+P(E)
    • P(c);SBLOCK::S(G)
    • P(c);SBLOCK::B(I)
  • Tries
    • Try
      • Q(D);
      • Threat
        • B(I)
      • Vars
        • K(b);S_FLIGHT::S(G),XP(c)
      • Refutation
        • S(a);
    • Try
      • Q(D);
      • Threat
        • S(G),XP(c)
      • Vars
        • K(b);S_FLIGHT::S(G),XP(c)
        • P(c);XP(H)::S(G)
        • P(c);::S(G)
      • Refutation
        • S(a);
    • Try
      • Q(D);CHECK
      • Refutation
        • K(b);P-FLIGHT,XQ(D)
    • Try
      • P(C);
      • Vars
        • P(c);SBLOCK,XP(H)::R(F)+P(E)
        • S(a);SBLOCK::QAB(D)
        • S(a);N_GUARD::P(B)
        • P(c);SBLOCK::S(G)
        • P(c);SBLOCK::B(I)
      • Refutation
        • S(a);
  • Actual
    • P(B);
    • Vars
      • P(c);SBLOCK,XP(H)::R(F)+P(E)
      • S(a);SBLOCK::QAB(D)
      • S(a);N_GUARD,SBLOCK::P(C)
      • S(a);N_GUARD::P(B)
      • P(c);SBLOCK::S(G)
      • P(c);SBLOCK::B(I)
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