MESON Chess Problem Database

Problem Display
PID: 80835 (8/8/8/Q7/8/1p6/Np6/1k2K3 w - - 0 1)

Akerblom, Johan Axel

Sodra Delarnes Tidning, 1928

8/8/8/Q7/8/1p6/Np6/1k2K3

#2

3 + 3

3713 Snap 2009
5454 Near Snap 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Ka1
      • 2.Sc3#
    • 1...Kc2
      • 2.Qf5#
  • Tries
    • 1.Kd1?
      • threat
        • 2.Sc3#
      • 1...Ka1
        • 2.Sc3#
      • 1...bxa2!
    • 1.Kd2?
      • threat
        • 2.Sc3#
      • 1...Ka1
        • 2.Sc3#
      • 1...bxa2!
    • 1.Ke2?
      • 1...Ka1
        • 2.Sc3#
      • 1...Kc2
        • 2.Qf5#
      • 1...bxa2!
    • 1.Qa6?
      • 1...Ka1
        • 2.Sc3#
      • 1...Kc2
        • 2.Qg6#
      • 1...bxa2!
    • 1.Qa7?
      • 1...Ka1
        • 2.Sc3#
      • 1...Kc2
        • 2.Qh7#
      • 1...bxa2!
    • 1.Qa8?
      • 1...Ka1
        • 2.Sc3#
      • 1...Kc2
        • 2.Qe4#
      • 1...bxa2!
  • Keys
    • 1.Qa4!
      • 1...Ka1
        • 2.Sc3#
      • 1...Kc2
        • 2.Qe4#
      • 1...bxa2
        • 2.Qd1#

Anticipated by 9316(1876), 208783(1876), 248226(1880), 182373(1906)

This anticipates 178142(1959), 79327(1960), 67025(2001), 164584(2007)

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 1
    • ADDED MATES = 1
    • REMOVED MATES = 0
  • Sets
    • K(a);P-FLIGHT::QAR(C)+S(B)
    • K(a);S_FLIGHT::QAB(C)
  • Tries
    • Try
      • K(A);P-FLIGHT
      • Threat
        • S(B)
      • Vars
        • K(a);P-FLIGHT::QAR(C)+S(B)
      • Refutation
        • P(c);XS(B)
    • Try
      • K(A);S_FLIGHT
      • Threat
        • S(B)
      • Vars
        • K(a);P-FLIGHT::QAR(C)+S(B)
      • Refutation
        • P(c);XS(B)
    • Try
      • K(A);P-FLIGHT
      • Vars
        • K(a);P-FLIGHT::QAR(C)+S(B)
        • K(a);S_FLIGHT::QAB(C)
      • Refutation
        • P(c);XS(B)
    • Try
      • Q(C);
      • Vars
        • K(a);P-FLIGHT::QAR(C)+S(B)
        • K(a);S_FLIGHT::QAB(C)
      • Refutation
        • P(c);XS(B)
    • Try
      • Q(C);
      • Vars
        • K(a);P-FLIGHT::QAR(C)+S(B)
        • K(a);S_FLIGHT::QAB(C)
      • Refutation
        • P(c);XS(B)
    • Try
      • Q(C);
      • Vars
        • K(a);P-FLIGHT::QAR(C)+S(B)
        • K(a);S_FLIGHT::QAB(C)
      • Refutation
        • P(c);XS(B)
  • Actual
    • Q(C);
    • Vars
      • K(a);P-FLIGHT::QAR(C)+S(B)
      • K(a);P_SPINP(c),S_FLIGHT::QAB(C)
      • P(c);OGATE,SBLOCK,XS(B)::QAR2(C)
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