MESON Chess Problem Database

Problem Display
PID: 117135 (K7/p4NnB/r5R1/4P1Q1/2Ppk3/1R3q2/3P1r2/8 w - - 0 1)

Kubbel, Leonid Ivanovich (AKA Kubbel, Karl Artur Leonid)

1st Prize, Rigaer Rundschau, 1934

K7/p4NnB/r5R1/4P1Q1/2Ppk3/1R3q2/3P1r2/8

#2

9 + 7

6490 yacpdb 2009
56 The Problemist 2011
15513 Selected Chess Problems of Colin Sydenham 2015

SOLUTION

  • SOUND
  • Sets
    • 1...Ra1
      • 2.Sd6#
    • 1...Ra2
      • 2.Sd6#
    • 1...Ra3
      • 2.Sd6#
    • 1...Ra4
      • 2.Sd6#
    • 1...Ra5
      • 2.Sd6#
    • 1...Rd6
      • 2.Sxd6#
    • 1...Rxg6
      • 2.Sd6#
  • Tries
    • 1.Rxg7+?
      • 1...Rg6
        • 2.Sd6#
      • 1...Qf5!
    • 1.Qh4+?
      • 1...Kf5+
        • 2.Rc6#
      • 1...Qg4
        • 2.Rxg4#
      • 1...Qf4!
    • 1.Qg4+?
      • 1...Qxg4
        • 2.Rxg4#
      • 1...Qf4!
  • Keys
    • 1.Qg3!
      • threat
        • 2.Rg4#
      • 1...Kf5+
        • 2.Rc6#
      • 1...Rxg6
        • 2.Sd6#
      • 1...Qf5
        • 2.d3#
      • 1...Qg4
        • 2.Rxg4#
      • 1...Qf4
        • 2.Qd3#
      • 1...Sf5
        • 2.Sg5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 6
  • Sets
    • R(e);N_GUARD::S(G)
    • R(e);N_GUARD::S(G),XR(e)
    • R(e);N_GUARD,P_SPINR(e),XR(F)::S(G)
  • Tries
    • Try
      • R(F);CHECK,XS(g)
      • Vars
        • R(e);P_SPINR(e)::S(G)
      • Refutation
        • Q(b);P_SPINQ(b)
    • Try
      • Q(E);CHECK
      • Vars
        • K(d);CHECK,S_FLIGHT::B(H)+R(F)
        • Q(b);P_SPINQ(b)::B(H)+R(F),DCHECK,XQ(b)
      • Refutation
        • Q(b);P_SPINQ(b)
    • Try
      • Q(E);CHECK
      • Vars
        • Q(b);OGATE,XQ(E)::B(H)+R(F),DCHECK,XQ(b)
      • Refutation
        • Q(b);P_SPINQ(b)
  • Actual
    • Q(E);
    • Threat
      • B(H)+R(F),DCHECK
    • Vars
      • K(d);CHECK,S_FLIGHT::B(H)+R(F)
      • R(e);N_GUARD,P_SPINR(e),XR(F)::S(G)
      • Q(b);N_GUARD,SBLOCK::P(A)
      • Q(b);::B(H)+R(F),DCHECK,XQ(b)
      • Q(b);OGATE,SBLOCK::QAB1(E)
      • S(g);SBLOCK::S(G)
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