MESON Chess Problem Database

Problem Display
PID: 178751 (3B4/6pK/8/7k/3N4/6r1/Q7/8 w - - 0 1)

Larsson, Bror

Springaren, 1960

3B4/6pK/8/7k/3N4/6r1/Q7/8

#2

4 + 3

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Tries
    • 1.Qd5+?
      • 1...Kg4
        • 2.Qf5#
      • 1...Rg5
        • 2.Qxg5#
      • 1...g5!
    • 1.Qf7+?
      • 1...Kg4
        • 2.Qf5#
      • 1...Rg6
        • 2.Qxg6#
      • 1...g6!
    • 1.Qe2+?
      • 1...Rf3
        • 2.Qxf3#
      • 1...Rg4!
    • 1.Qa5+?
      • 1...Kg4
        • 2.Qf5#
      • 1...Rg5
        • 2.Qxg5#
      • 1...g5!
  • Keys
    • 1.Qh2+!
      • 1...Kg4
        • 2.Qh4#
      • 1...Rh3
        • 2.Qxh3#

FEATURES

  • Static
    • TYPE = CHECKING_KEY
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • Q(A);CHECK
      • Vars
        • K(b);S_FLIGHT::QAB1(A)
        • R(a);N_GUARD,P_SPINR(a)::QAR1(A),XR(a)
      • Refutation
        • P(c);P_SPINP(c)
    • Try
      • Q(A);CHECK
      • Vars
        • K(b);S_FLIGHT::QAB1(A)
        • R(a);N_GUARD,P_SPINR(a)::QAB1(A),XR(a)
      • Refutation
        • P(c);P_SPINP(c)
    • Try
      • Q(A);CHECK
      • Vars
        • R(a);N_GUARD,P_SPINR(a)::QAB(A),XR(a)
      • Refutation
        • R(a);P_SPINR(a)
    • Try
      • Q(A);CHECK
      • Vars
        • K(b);S_FLIGHT::QAB1(A)
        • R(a);N_GUARD,P_SPINR(a)::QAR1(A),XR(a)
      • Refutation
        • P(c);P_SPINP(c)
  • Actual
    • Q(A);CHECK
    • Vars
      • K(b);S_FLIGHT::QAR1(A)
      • R(a);N_GUARD,P_SPINR(a)::QAR2(A),XR(a)
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