MESON Chess Problem Database

Problem Display
PID: 120973 (8/8/8/8/1N6/1pNQK3/1k6/b7 w - - 0 1)

Hellstrom, Ake

Source?, 1934

8/8/8/8/1N6/1pNQK3/1k6/b7

#2

4 + 3

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Kc1
      • 2.Qb1#
      • 2.Qd2#
  • Tries
    • 1.Ke2?
      • 1...Kc1
        • 2.Qb1#
        • 2.Qd2#
      • 1...Ka3!
    • 1.Sa4+?
      • 1...Kc1
        • 2.Qf1#
      • 1...Ka3!
    • 1.Sbd5?
      • 1...Kc1
        • 2.Qb1#
        • 2.Qd2#
      • 1...Ka3!
    • 1.Sa6?
      • 1...Kc1
        • 2.Qb1#
        • 2.Qd2#
      • 1...Ka3!
    • 1.Sc6?
      • 1...Kc1
        • 2.Qb1#
        • 2.Qd2#
      • 1...Ka3!
    • 1.Qe2+?
      • 1...Kc1
        • 2.Sd3#
        • 2.Qd2#
      • 1...Kxc3
        • 2.Sd5#
      • 1...Ka3!
    • 1.Qe4?
      • 1...Kc1
        • 2.Qb1#
      • 1...Kxc3
        • 2.Qd4#
      • 1...Ka3!
    • 1.Qa6?
      • 1...Kc1
        • 2.Qxa1#
      • 1...Kxc3!
    • 1.Qd1?
      • 1...Kxc3
        • 2.Qd4#
      • 1...Ka3!
    • 1.Qd4?
      • 1...Kc1
        • 2.Qd2#
      • 1...Ka3!
    • 1.Qd5?
      • 1...Kc1
        • 2.Qd2#
      • 1...Kxc3
        • 2.Qd4#
      • 1...Ka3!
    • 1.Qd7?
      • 1...Kc1
        • 2.Qd2#
      • 1...Kxc3
        • 2.Qd4#
      • 1...Ka3!
    • 1.Qd8?
      • 1...Kc1
        • 2.Qd2#
      • 1...Kxc3
        • 2.Qd4#
      • 1...Ka3!
  • Keys
    • 1.Qd6!
      • 1...Kc1
        • 2.Qd2#
      • 1...Ka3
        • 2.Sd3#
      • 1...Kxc3
        • 2.Qd4#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • K(C);P-FLIGHT
      • Refutation
        • K(b);S_FLIGHT
    • Try
      • S(A);CHECK
      • Vars
        • K(b);S_FLIGHT::QAR(B)
      • Refutation
        • K(b);P_SPINP(c),S_FLIGHT
    • Try
      • S(D);
      • Refutation
        • K(b);S_FLIGHT
    • Try
      • S(D);
      • Refutation
        • K(b);S_FLIGHT
    • Try
      • S(D);
      • Refutation
        • K(b);S_FLIGHT
    • Try
      • Q(B);CHECK
      • Vars
        • K(b);S_FLIGHT,XS(A)::S(D)
      • Refutation
        • K(b);S_FLIGHT
    • Try
      • Q(B);
      • Vars
        • K(b);S_FLIGHT::QAR1(B)
        • K(b);OGATEB,S_FLIGHT,XS(A)::QAB1(B)
      • Refutation
        • K(b);S_FLIGHT
    • Try
      • Q(B);
      • Vars
        • K(b);S_FLIGHT::QAR2(B),XB(a)
      • Refutation
        • K(b);S_FLIGHT,XS(A)
    • Try
      • Q(B);
      • Vars
        • K(b);OGATEB,S_FLIGHT,XS(A)::QAB1(B)
      • Refutation
        • K(b);S_FLIGHT
    • Try
      • Q(B);
      • Vars
        • K(b);S_FLIGHT::QAB1(B)
      • Refutation
        • K(b);S_FLIGHT
    • Try
      • Q(B);
      • Vars
        • K(b);S_FLIGHT::QAB1(B)
        • K(b);OGATEB,S_FLIGHT,XS(A)::QAB1(B)
      • Refutation
        • K(b);S_FLIGHT
    • Try
      • Q(B);
      • Vars
        • K(b);S_FLIGHT::QAB1(B)
        • K(b);OGATEB,S_FLIGHT,XS(A)::QAB1(B)
      • Refutation
        • K(b);S_FLIGHT
    • Try
      • Q(B);
      • Vars
        • K(b);S_FLIGHT::QAB1(B)
        • K(b);OGATEB,S_FLIGHT,XS(A)::QAB1(B)
      • Refutation
        • K(b);S_FLIGHT
  • Actual
    • Q(B);
    • Vars
      • K(b);S_FLIGHT::QAB1(B)
      • K(b);S_FLIGHT::QAB(B)+S(D)
      • K(b);OGATEB,S_FLIGHT,XS(A)::QAB1(B)
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