MESON Chess Problem Database

Problem Display
PID: 206345 (6N1/8/N5p1/3b2p1/3k2P1/8/1P6/1B3QK1 w - - 0 1)

Strom, Gustav

Schackvarlden, 1925

6N1/8/N5p1/3b2p1/3k2P1/8/1P6/1B3QK1

#2

7 + 4

6490 yacpdb 2020
5454 Near Snap 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Ke3
      • 2.Qf2#
    • 1...Ke5
      • 2.Qf6#
  • Tries
    • 1.Qf2+?
      • 1...Ke5
        • 2.Qf6#
      • 1...Kc4!
    • 1.Qf4+?
      • 1...Be4
        • 2.Qxe4#
      • 1...gxf4!
    • 1.Qf5?
      • 1...Ke3
        • 2.Qf2#
      • 1...Kc4
        • 2.Qd3#
      • 1...Bxg8
        • 2.Qe4#
        • 2.Qc5#
      • 1...Bh1
        • 2.Qc5#
      • 1...Ba2
        • 2.Qe4#
        • 2.Qc5#
      • 1...Bg2
        • 2.Qc5#
      • 1...Bb3
        • 2.Qe4#
        • 2.Qc5#
      • 1...Bf3
        • 2.Qc5#
      • 1...Bc4
        • 2.Qe4#
        • 2.Qc5#
      • 1...Be4
        • 2.Qxe4#
        • 2.Qc5#
      • 1...Bc6
        • 2.Qc5#
      • 1...Be6
        • 2.Qe4#
        • 2.Qc5#
      • 1...Bb7
        • 2.Qc5#
      • 1...Bf7
        • 2.Qe4#
        • 2.Qc5#
      • 1...Ba8
        • 2.Qc5#
      • 1...gxf5!
    • 1.Qf6+?
      • 1...Ke3
        • 2.Qf2#
      • 1...Kc4!
  • Keys
    • 1.Qf8!
      • 1...Ke3
        • 2.Qf2#
      • 1...Kc4
        • 2.Qb4#
      • 1...Ke5
        • 2.Qf6#
      • 1...Bxg8
        • 2.Qc5#
      • 1...Bh1
        • 2.Qc5#
      • 1...Ba2
        • 2.Qc5#
      • 1...Bg2
        • 2.Qc5#
      • 1...Bb3
        • 2.Qc5#
      • 1...Bf3
        • 2.Qc5#
      • 1...Be4
        • 2.Qc5#
      • 1...Bc6
        • 2.Qc5#
      • 1...Be6
        • 2.Qc5#
      • 1...Bb7
        • 2.Qc5#
      • 1...Bf7
        • 2.Qc5#
      • 1...Ba8
        • 2.Qc5#
      • 1...Bc4
        • 2.Qc5#

This anticipates 178127(1940), 211723(1986), 234621(2003)

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 14
    • REMOVED MATES = 0
  • Sets
    • K(a);S_FLIGHT::QAB1(B)
  • Tries
    • Try
      • Q(B);CHECK
      • Vars
        • K(a);S_FLIGHT::QAB1(B)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • Q(B);CHECK
      • Vars
        • B(b);N_GUARD,P_SPINB(b)::QAR1(B),XB(b)
      • Refutation
        • P(c);XQ(B)
    • Try
      • Q(B);
      • Vars
        • K(a);S_FLIGHT::QAB1(B)
        • K(a);P-FLIGHT::QAB1(B)
        • B(b);OGATE::QAB1(B)
      • Refutation
        • P(d);XQ(B)
    • Try
      • Q(B);CHECK
      • Vars
        • K(a);S_FLIGHT::QAB1(B)
      • Refutation
        • K(a);P-FLIGHT
  • Actual
    • Q(B);
    • Vars
      • K(a);S_FLIGHT::QAB1(B)
      • K(a);P-FLIGHT::QAR1(B)
      • B(b);XS(G)::QAB1(B)
      • B(b);::QAB1(B)
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