MESON Chess Problem Database

Problem Display
PID: 157550 (8/2K2B2/8/2Q5/k7/P7/2n5/r7 w - - 0 1)

Hermanson, Halvar

Schackvarlden, 1930

8/2K2B2/8/2Q5/k7/P7/2n5/r7

#2

4 + 3

5454 Near Snap 2016
15148 Sadier Collection 2016

SOLUTION

  • SOUND
  • Sets
    • 1...Se1
      • 2.Qb4#
    • 1...Se3
      • 2.Qb4#
    • 1...Sb4
      • 2.Qxb4#
    • 1...Sd4
      • 2.Qb4#
  • Tries
    • 1.Bc4?
      • threat
        • 2.Qa7#
      • 1...Rxa3
        • 2.Qb5#
      • 1...Sb4
        • 2.Qxb4#
      • 1...Sxa3!
    • 1.Qc4+?
      • 1...Kxa3
        • 2.Qb3#
      • 1...Sb4
        • 2.Qxb4#
      • 1...Ka5!
    • 1.Qb5+?
      • 1...Kxa3
        • 2.Qb3#
      • 1...Kxb5!
  • Keys
    • 1.Qb6!
      • threat
        • 2.Qa6#
      • 1...Kxa3
        • 2.Qb3#
      • 1...Rxa3
        • 2.Be8#
      • 1...Sxa3
        • 2.Bb3#
      • 1...Sb4
        • 2.Qxb4#

Anticipated by 9626(1907)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 3
  • Sets
    • S(b);N_GUARD::QAR1(B)
    • S(b);N_GUARD::QAR1(B),XS(b)
  • Tries
    • Try
      • B(D);
      • Threat
        • QAR(B)
      • Vars
        • R(a);SBLOCK,XP(A)::QAB1(B)
        • S(b);N_GUARD::QAR1(B),XS(b)
      • Refutation
        • S(b);XP(A)
    • Try
      • Q(B);CHECK
      • Vars
        • K(c);P-FLIGHT,XP(A)::QAR1(B)
        • S(b);N_GUARD,P_SPINS(b)::QAR1(B),XS(b)
      • Refutation
        • K(c);P-FLIGHT
    • Try
      • Q(B);CHECK
      • Vars
        • K(c);P-FLIGHT,XP(A)::QAR1(B)
      • Refutation
        • K(c);S_FLIGHT,XQ(B)
  • Actual
    • Q(B);
    • Threat
      • QAR2(B)
    • Vars
      • K(c);P-FLIGHT,XP(A)::QAR1(B)
      • R(a);SBLOCK,XP(A)::B(D)
      • S(b);SBLOCK,XP(A)::B(D)
      • S(b);N_GUARD::QAR1(B),XS(b)
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