MESON Chess Problem Database

Problem Display
PID: 220395 (8/8/8/8/3p2Q1/3P4/1K2p3/1N1k4 w - - 0 1)

Torngren, Pehr Hendrik

Die Schwalbe, 1928

8/8/8/8/3p2Q1/3P4/1K2p3/1N1k4

#2

4 + 3

5454 Near Snap 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Ke1
      • 2.Qg1#
  • Tries
    • 1.Kb3?
      • 1...Ke1
        • 2.Qg1#
      • 1...Kc1!
    • 1.Sc3+?
      • 1...Ke1
        • 2.Qxe2#
      • 1...Kd2
        • 2.Qxe2#
      • 1...dxc3+!
    • 1.Qg5?
      • threat
        • 2.Qc1#
        • 2.Qd2#
      • 1...Ke1
        • 2.Qg1#
      • 1...e1S
        • 2.Qd2#
      • 1...e1B
        • 2.Qg4#
        • 2.Qh5#
      • 1...e1R
        • 2.Qd2#
      • 1...e1Q!
  • Keys
    • 1.Qg2!
      • 1...Ke1
        • 2.Qg1#
      • 1...e1Q
        • 2.Qc2#
      • 1...e1S
        • 2.Qd2#
      • 1...e1B
        • 2.Qf3#
        • 2.Qc2#
        • 2.Qg4#
      • 1...e1R
        • 2.Qc2#
        • 2.Qd2#

Anticipated by 17213(1925-1926)

FEATURES

  • Static
    • TYPE = WAITER
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • K(a);N_SPINP(b),P-FLIGHT::QAR2(D)
  • Tries
    • Try
      • K(B);P-FLIGHT
      • Vars
        • K(a);N_SPINP(b),P-FLIGHT::QAR2(D)
      • Refutation
        • K(a);N_SPINP(b),P-FLIGHT
    • Try
      • S(A);CHECK
      • Vars
        • K(a);N_SPINP(b),P-FLIGHT::QAR1(D),XP(b)
      • Refutation
        • P(c);CHECK,XS(A)
    • Try
      • Q(D);N_PINP(b)
      • Threat
        • DUALS(2)
      • Vars
        • K(a);P-FLIGHT::QAR2(D)
        • P(b);::QAR1(D)
      • Refutation
        • P(b);
  • Actual
    • Q(D);N_PINP(b)
    • Vars
      • K(a);P-FLIGHT::QAR2(D)
      • P(b);OGATE,SBLOCK::QAB1(D)
      • P(b);OGATE::QAR1(D)
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Developed and maintained by Brian Stephenson.
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