MESON Chess Problem Database

Problem Display
PID: 213812 (8/K7/NB1p4/2rkp3/R1bNq2R/8/Q7/8 w - - 0 1)

Nenonen, Julius

Suomen Shakki, 1930

8/K7/NB1p4/2rkp3/R1bNq2R/8/Q7/8

#2

7 + 6

15148 Sadier Collection 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Kxd4
      • 2.Qd2#
    • 1...Qh1
      • 2.Sb4#
    • 1...Qc2
      • 2.Sb4#
    • 1...Qg2
      • 2.Sb4#
    • 1...Qd3
      • 2.Sb4#
    • 1...Qf3
      • 2.Sb4#
    • 1...Qf5
      • 2.Sb4#
    • 1...Qg6
      • 2.Sb4#
    • 1...Qe2
      • 2.Sb4#
    • 1...Qe3
      • 2.Sb4#
    • 1...Ra5
      • 2.Rxa5#
      • 2.Qxc4#
    • 1...Rb5
      • 2.Sc7#
      • 2.Qxc4#
    • 1...Rc6
      • 2.Sb4#
    • 1...Rc7+
      • 2.Sxc7#
    • 1...Rc8
      • 2.Sb4#
  • Tries
    • 1.Sc7+?
      • 1...Kxd4
        • 2.Qd2#
      • 1...Rxc7+!
  • Keys
    • 1.Qg2!
      • threat
        • 2.Qxe4#
      • 1...Rc7+
        • 2.Sxc7#
      • 1...Kxd4
        • 2.Qd2#
      • 1...Qxg2
        • 2.Sb4#
      • 1...Qf3
        • 2.Sb4#
      • 1...Bd3
        • 2.Qg8#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 9
  • Sets
    • K(d);OGATEB,P-FLIGHT,P_SPINQ(b),P_SPINR(c),XS(C)::QAR2(A)
    • Q(b);::S(E)
    • R(c);::S(E)
    • R(c);CHECK,N_GUARD::S(E),XR(c)
  • Tries
    • Try
      • S(E);CHECK
      • Vars
        • K(d);P-FLIGHT,P_SPINQ(b),P_SPINR(c),XS(C)::QAR2(A)
      • Refutation
        • R(c);CHECK,XS(E)
  • Actual
    • Q(A);N_PINB(a),P_PINQ(b)
    • Threat
      • QAB1(A),XQ(b)
    • Vars
      • R(c);CHECK,N_GUARD::S(E),XR(c)
      • K(d);OGATEB,P-FLIGHT,P_SPINB(a),P_SPINR(c),XS(C)::QAR2(A)
      • Q(b);N_SPINQ(b),XQ(A)::S(E)
      • Q(b);::S(E)
      • B(a);::QAB(A)
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