MESON Chess Problem Database

Problem Display
PID: 6313 (8/8/8/3Q4/3N1K2/B7/3kp3/3N4 w - - 0 1)

Torngren, Pehr Hendrik

2nd Prize, Schackvarlden, 1928

8/8/8/3Q4/3N1K2/B7/3kp3/3N4

#2

5 + 2

785 Het Belgisch Schaakbord (L'Echiquier Belge) 1951
3098 FIDE Album (1914-1944) (I) 1971
2838 Fun with Chess Miniatures 1996
133 The Problemist Supplement 2009

SOLUTION

  • SOUND
  • Tries
    • 1.Sb3+?
      • 1...Ke1
        • 2.Qh1#
      • 1...Kc2!
    • 1.Qa2+?
      • 1...Kxd1
        • 2.Qxe2#
      • 1...Ke1
        • 2.Qxe2#
      • 1...Kd3!
    • 1.Qg2?
      • threat
        • 2.Qxe2#
      • 1...Kxd1
        • 2.Qxe2#
      • 1...Ke1
        • 2.Qxe2#
      • 1...Kd3!
    • 1.Qe4?
      • threat
        • 2.Qxe2#
      • 1...Kxd1
        • 2.Qxe2#
      • 1...Ke1
        • 2.Qxe2#
      • 1...exd1Q
        • 2.Qe3#
      • 1...exd1B
        • 2.Qe3#
      • 1...exd1R
        • 2.Qe3#
      • 1...e1Q
        • 2.Qc2#
      • 1...e1S
        • 2.Qe2#
      • 1...e1B
        • 2.Qc2#
        • 2.Qe2#
      • 1...e1R
        • 2.Qc2#
      • 1...exd1S!
    • 1.Qa5+?
      • 1...Kd3
        • 2.Qc3#
      • 1...Kxd1!
  • Keys
    • 1.Qc4!
      • threat
        • 2.Qxe2#
      • 1...Kxd1
        • 2.Qxe2#
        • 2.Qc1#
      • 1...Ke1
        • 2.Qxe2#
      • 1...exd1Q
        • 2.Bb4#
      • 1...exd1S
        • 2.Sf3#
      • 1...exd1B
        • 2.Bb4#
      • 1...exd1R
        • 2.Sf3#
        • 2.Bb4#
      • 1...e1Q
        • 2.Qc2#
      • 1...e1S
        • 2.Qe2#
      • 1...e1B
        • 2.Qe2#
        • 2.Qc2#
      • 1...e1R
        • 2.Qc2#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 7
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • S(C);CHECK
      • Vars
        • K(a);S_FLIGHT::QAR(E)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • Q(E);CHECK
      • Vars
        • K(a);OGATE,P-FLIGHT,XS(A)::QAB1(E),XP(b)
        • K(a);OGATE,S_FLIGHT::QAR1(E),XP(b)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • Q(E);P_PINP(b)
      • Threat
        • QAR1(E),XP(b)
      • Vars
        • K(a);N_SPINP(b),P-FLIGHT,XS(A)::QAB1(E),XP(b)
        • K(a);N_SPINP(b),S_FLIGHT::QAR1(E),XP(b)
      • Refutation
        • K(a);N_SPINP(b),P-FLIGHT
    • Try
      • Q(E);
      • Threat
        • QAR1(E),XP(b)
      • Vars
        • K(a);P-FLIGHT,XS(A)::QAB1(E),XP(b)
        • K(a);P_SPINP(b),S_FLIGHT::QAR1(E),XP(b)
        • P(b);SBLOCK,XS(A)::QAB1(E)
        • P(b);SBLOCK::QAR1(E)
        • P(b);::QAR1(E)
      • Refutation
        • P(b);XS(A)
    • Try
      • Q(E);CHECK
      • Vars
        • K(a);P-FLIGHT::QAR1(E)
      • Refutation
        • K(a);P-FLIGHT,XS(A)
  • Actual
    • Q(E);
    • Threat
      • QAR1(E),XP(b)
    • Vars
      • K(a);S_FLIGHT::QAR1(E),XP(b)
      • P(b);SBLOCK,XS(A)::B(B)
      • P(b);SBLOCK,XS(A)::S(C)
      • P(b);SBLOCK::QAR1(E)
      • P(b);::QAR1(E)
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