MESON Chess Problem Database

Problem Display
PID: 22080 (8/8/6p1/6B1/8/8/2Qpk1K1/4b3 w - - 0 1)

Lester, William Edward

Empire Review, 1924

8/8/6p1/6B1/8/8/2Qpk1K1/4b3

#2

3 + 4

887 Mate in Two Moves 1931
2012 Miniature Chess Problems from Many Countries 1981
3310 2345 Chess Problems 1997
5454 Near Snap 2007
133 The Problemist Supplement 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Bf2
      • 2.Qxd2#
    • 1...Bg3
      • 2.Qxd2#
    • 1...Bh4
      • 2.Qxd2#
  • Tries
    • 1.Bf4?
      • 1...Bf2
        • 2.Qxd2#
      • 1...Bg3
        • 2.Qxd2#
      • 1...Bh4
        • 2.Qxd2#
      • 1...g5!
    • 1.Bh6?
      • 1...Bf2
        • 2.Qxd2#
      • 1...Bg3
        • 2.Qxd2#
      • 1...Bh4
        • 2.Qxd2#
      • 1...g5!
    • 1.Qc3?
      • threat
        • 2.Qf3#
      • 1...Bf2
        • 2.Qxd2#
      • 1...Bg3
        • 2.Qxd2#
      • 1...Bh4
        • 2.Qxd2#
      • 1...Kd1!
  • Keys
    • 1.Qb1!
      • 1...d1Q
        • 2.Qe4#
      • 1...d1S
        • 2.Qb5#
      • 1...d1B
        • 2.Qe4#
        • 2.Qb5#
      • 1...d1R
        • 2.Qe4#
      • 1...Bf2
        • 2.Qf1#
      • 1...Bg3
        • 2.Qf1#
      • 1...Bh4
        • 2.Qf1#

Anticipated by 47236(1917), 22005(1923)

This anticipates 109519(1934), 179999(1952), 234085(1970), 102450(1988)

FEATURES

  • Static
    • TYPE = MUTATE
    • CHANGED MATES = 3
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • B(a);N_GUARD::QAR1(A),XP(b)
  • Tries
    • Try
      • B(C);
      • Vars
        • B(a);N_GUARD::QAR1(A),XP(b)
      • Refutation
        • P(d);
    • Try
      • B(C);
      • Vars
        • B(a);N_GUARD::QAR1(A),XP(b)
      • Refutation
        • P(d);
    • Try
      • Q(A);N_PINP(b)
      • Threat
        • QAB1(A)
      • Vars
        • B(a);N_GUARD::QAR1(A),XP(b)
      • Refutation
        • K(c);S_FLIGHT
  • Actual
    • Q(A);N_PINP(b)
    • Vars
      • P(b);SBLOCK::QAR2(A)
      • P(b);SBLOCK::QAB(A)
      • B(a);OGATE::QAB1(A)
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