MESON Chess Problem Database

Problem Display
PID: 71667 (3K1Q2/1pN4p/1Pk3bR/P2N1n2/4BP2/1P1rP3/2q5/2Rn4 w - - 0 1)

Gugel, Lev Nikolaevich

Shakhmaty, 1932

3K1Q2/1pN4p/1Pk3bR/P2N1n2/4BP2/1P1rP3/2q5/2Rn4

#2

12 + 8

133 The Problemist Supplement 2010

SOLUTION

  • SOUND
  • Sets
    • 1...Qc4
      • 2.Rxc4#
    • 1...Qc5
      • 2.Rxc5#
      • 2.Qxc5#
    • 1...Rxb3
      • 2.Sb4#
      • 2.Sf6#
    • 1...Rc3
      • 2.Sb4#
    • 1...Rxe3
      • 2.Sxe3#
      • 2.Sb4#
    • 1...Rxd5+
      • 2.Bxd5#
    • 1...Sd4
      • 2.Sc3#
      • 2.Sb4#
  • Tries
    • 1.Rxc2+?
      • 1...Rc3
        • 2.Sxc3#
        • 2.Sb4#
        • 2.Sf6#
      • 1...Sc3!
    • 1.Rxg6+?
      • 1...Sd6
        • 2.Qxd6#
      • 1...hxg6!
  • Keys
    • 1.b4!
      • threat
        • 2.b5#
      • 1...Rxd5+
        • 2.Bxd5#
      • 1...Se7
        • 2.Qf6#
      • 1...Rb3
        • 2.Sf6#
      • 1...Sc3
        • 2.Qc5#
      • 1...Sd4
        • 2.Sc3#
      • 1...Sd6
        • 2.Se7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 2
  • Sets
    • Q(b);OGATE::R(A),XQ(b)
    • R(c);N_PINS(G),N_SPINQ(b)::B(D)+S(G),DCHECK
    • R(c);CHECK,OGATE,P_SPINR(c),XS(G)::B(D),XR(c)
  • Tries
    • Try
      • R(A);CHECK,XQ(b)
      • Refutation
        • S(a);P_SPINS(a)
    • Try
      • R(I);CHECK,XB(f)
      • Vars
        • S(d);N_GUARD,N_PINS(G),P_SPINS(d)::QAR1(L),XS(d)
      • Refutation
        • P(h);XR(I)
  • Actual
    • P(B);
    • Threat
      • P(B)
    • Vars
      • R(c);CHECK,OGATE,P_SPINR(c),XS(G)::B(D),XR(c)
      • S(d);N_GUARD::QAR(L)
      • R(c);N_PINS(G)::B(D)+S(G)
      • S(a);N_SPINQ(b),S_CUTQ(b)::QAR1(L)
      • S(d);N_PINS(G)::B(D)+S(G)
      • S(d);N_PINS(G),N_SPINB(f),SBLOCK::B(D)+S(G),DCHECK
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