MESON Chess Problem Database

Problem Display
PID: 134253 (8/8/2N5/8/k1P5/8/K1N4q/3Q4 w - - 0 1)

Helweg, Steffen ('Cyrano')

Berlinske Tidende, 1937

8/8/2N5/8/k1P5/8/K1N4q/3Q4

#2

5 + 2

56 The Problemist 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Qg1
      • 2.Se1#
    • 1...Qg3
      • 2.Se3#
    • 1...Qf4
      • 2.Sa1#
      • 2.Se1#
      • 2.Sa3#
      • 2.Se3#
      • 2.S2b4#
      • 2.S2d4#
    • 1...Qe5
      • 2.Sa1#
      • 2.Se1#
      • 2.Sa3#
      • 2.Se3#
      • 2.S2b4#
      • 2.S2d4#
    • 1...Qd6
      • 2.S2d4#
    • 1...Qc7
      • 2.Sa1#
      • 2.Se1#
      • 2.Sa3#
      • 2.Se3#
      • 2.S2b4#
      • 2.S2d4#
    • 1...Qb8
      • 2.S2b4#
    • 1...Qh1
      • 2.Se1#
    • 1...Qxc2+
      • 2.Qxc2#
    • 1...Qh3
      • 2.Se3#
    • 1...Qh4
      • 2.Sa1#
      • 2.Se1#
      • 2.Sa3#
      • 2.Se3#
      • 2.S2b4#
      • 2.S2d4#
    • 1...Qh6
      • 2.Sa1#
      • 2.Se1#
      • 2.Sa3#
      • 2.Se3#
      • 2.S2b4#
      • 2.S2d4#
    • 1...Qh8
      • 2.Sa1#
      • 2.Se1#
      • 2.Sa3#
      • 2.Se3#
      • 2.S2b4#
      • 2.S2d4#
  • Tries
    • 1.Qb1?
      • threat
        • 2.Qb3#
        • 2.Qb4#
        • 2.Qb5#
      • 1...Qxc2+
        • 2.Qxc2#
      • 1...Qg3
        • 2.Qb4#
        • 2.Qb5#
      • 1...Qe5
        • 2.Qb3#
        • 2.Qb4#
      • 1...Qd6
        • 2.Qb3#
        • 2.Qb5#
      • 1...Qd2
        • 2.Qb3#
        • 2.Qb5#
      • 1...Qh3
        • 2.Qb4#
        • 2.Qb5#
      • 1...Qh5
        • 2.Qb3#
        • 2.Qb4#
      • 1...Qb8!
    • 1.Qd2?
      • threat
        • 2.Qb4#
        • 2.Qa5#
      • 1...Qe5
        • 2.Qb4#
      • 1...Qd6
        • 2.Qa5#
      • 1...Qc7
        • 2.Qb4#
      • 1...Qb8
        • 2.Qa5#
      • 1...Qh5
        • 2.Qb4#
      • 1...Qxd2!
  • Keys
    • 1.Kb2!
      • threat
        • 2.Qa1#
      • 1...Qe5+
        • 2.S2d4#
      • 1...Qb8+
        • 2.S2b4#
      • 1...Qxc2+
        • 2.Qxc2#
      • 1...Qh8+
        • 2.S2d4#
      • 1...Qg1
        • 2.Se1#
      • 1...Qg3
        • 2.Se3#
      • 1...Qd6
        • 2.S2d4#
      • 1...Qh1
        • 2.Se1#
      • 1...Qh3
        • 2.Se3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • Q(a);N_PINS(C)::QAB(A)+S(C)
    • Q(a);CHECK,OGATE,P_SPINQ(a),XS(C)::QAB(A),XQ(a)
    • Q(a);N_PINS(C),SBLOCK::QAB(A)+S(C)
  • Tries
    • Try
      • Q(A);
      • Threat
        • DUALS(3)
      • Vars
        • Q(a);CHECK,OGATE,XS(C)::QAB(A),XQ(a)
      • Refutation
        • Q(a);N_PINS(C)
    • Try
      • Q(A);N_SPINS(C)
      • Threat
        • DUALS(2)
      • Vars
        • Q(a);::QAR1(A)
      • Refutation
        • Q(a);P_PINS(C),XQ(A)
  • Actual
    • K(B);P-FLIGHT
    • Threat
      • QAR(A)
    • Vars
      • Q(a);CHECK,N_PINS(C)::QAB(A)+S(C)
      • Q(a);CHECK,OGATE,P_SPINQ(a),XS(C)::QAB(A),XQ(a)
      • Q(a);N_PINS(C)::QAB(A)+S(C)
      • Q(a);N_PINS(C),SBLOCK::QAB(A)+S(C)
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