MESON Chess Problem Database

Problem Display
PID: 11677 (4Kn2/b1R4n/p3P3/1BPkPQ1r/2N1N1Rp/2rpP3/8/4q2b w - - 0 1)

Valuska, Jan

3rd Prize, Themes-64, 1970

4Kn2/b1R4n/p3P3/1BPkPQ1r/2N1N1Rp/2rpP3/8/4q2b

#2

11 + 11

3751 FIDE Album (1968-1970) 1977
273 Mat Plus 1994

SOLUTION

  • SOUND
  • Sets
    • 1...Qf2
      • 2.Sxc3#
    • 1...Qg3
      • 2.Sxc3#
    • 1...Qb1
      • 2.Sxc3#
    • 1...Qd1
      • 2.Sxc3#
    • 1...Qf1
      • 2.Sxc3#
    • 1...Qg1
      • 2.Sxc3#
    • 1...Qe2
      • 2.Sxc3#
    • 1...Qxe3
      • 2.Sxc3#
    • 1...Rxc4
      • 2.Bc6#
    • 1...Bxc5
      • 2.Rxc5#
    • 1...Bb6
      • 2.Sxb6#
    • 1...Bb8
      • 2.Sb6#
    • 1...Sg5
      • 2.Sf6#
    • 1...Sf6+
      • 2.Sxf6#
    • 1...Sxe6
      • 2.Rd7#
    • 1...Sg6
      • 2.Rd7#
    • 1...Sd7
      • 2.Rxd7#
    • 1...d2
      • 2.Sxc3#
  • Tries
    • 1.Rc6?
      • threat
        • 2.Rd6#
      • 1...Sf6+
        • 2.Sxf6#
      • 1...Bxe4
        • 2.Qxe4#
      • 1...Bxc5
        • 2.Rxc5#
      • 1...Bb8
        • 2.Sb6#
      • 1...axb5!
  • Keys
    • 1.Sg5!
      • threat
        • 2.Rd4#
      • 1...Sf6+
        • 2.exf6#
      • 1...Qxe3
        • 2.Sxe3#
      • 1...Rxc4
        • 2.Bxc4#
      • 1...Bxc5
        • 2.Bc6#
      • 1...Sxe6
        • 2.Qxe6#
      • 1...Be4
        • 2.Qxe4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 5
    • ADDED MATES = 1
    • REMOVED MATES = 13
  • Sets
    • Q(a);N_GUARD::S(C),XR(c)
    • Q(a);N_GUARD,XP(A)::S(C),XR(c)
    • R(c);SBLOCK,XS(B)::B(E)
    • B(i);OGATE,XP(F)::R1(J),XB(i)
    • B(i);N_GUARD::S(B),XB(i)
    • B(i);N_GUARD::S(B)
    • S(j);N_GUARD::S(C)
    • S(j);CHECK,N_GUARD::S(C),XS(j)
    • S(k);N_GUARD,XP(I)::R(J)
    • S(k);N_GUARD::R(J)
    • S(k);N_GUARD::R(J),XS(k)
    • P(d);S_CUTQ(a)::S(C),XR(c)
  • Tries
    • Try
      • R(J);
      • Threat
        • R1(J)
      • Vars
        • S(j);CHECK,N_GUARD::S(C),XS(j)
        • B(b);OGATE,XS(C)::QAB1(H),XB(b)
        • B(i);OGATE,XP(F)::R1(J),XB(i)
        • B(i);N_GUARD::S(B)
      • Refutation
        • P(h);XB(E)
  • Actual
    • S(C);
    • Threat
      • R1(D)
    • Vars
      • S(j);CHECK,OGATE::QAR(H)+P(G),XS(j)
      • Q(a);XP(A)::S(B),XQ(a)
      • R(c);OGATE,XS(B)::B(E),XR(c)
      • B(i);SBLOCK,XP(F)::B(E)
      • S(k);OGATE,XP(I)::QAB1(H),XS(k)
      • B(b);N_GUARD::QAB1(H),XB(b)
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