MESON Chess Problem Database

Problem Display
PID: 109519 (8/8/7p/7B/8/8/3Qpk1K/5b2 w - - 0 1)

Thorsson, Allan Birger

Ny Tid, 1934

8/8/7p/7B/8/8/3Qpk1K/5b2

#2

3 + 4

113 Shakhmaty v SSSR 1954
6490 yacpdb 2009
5454 Near Snap 2010

SOLUTION

  • SOUND
  • Sets
    • 1...Bg2
      • 2.Qxe2#
    • 1...Bh3
      • 2.Qxe2#
  • Tries
    • 1.Bg4?
      • 1...Bg2
        • 2.Qxe2#
      • 1...Bh3
        • 2.Qxe2#
      • 1...h5!
    • 1.Qd3?
      • threat
        • 2.Qg3#
      • 1...Bg2
        • 2.Qxe2#
      • 1...Bh3
        • 2.Qxe2#
      • 1...Ke1!
  • Keys
    • 1.Qc1!
      • 1...e1Q
        • 2.Qf4#
      • 1...e1S
        • 2.Qc5#
      • 1...e1B
        • 2.Qf4#
        • 2.Qc5#
      • 1...e1R
        • 2.Qf4#
      • 1...Bg2
        • 2.Qg1#
      • 1...Bh3
        • 2.Qg1#

Anticipated by 22005(1923), 22080(1924)

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

FEATURES

  • Static
    • TYPE = MUTATE
    • CHANGED MATES = 2
    • 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
      • 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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