MESON Chess Problem Database

Problem Display
PID: 140992 (2R5/1pB1pN2/pP2P3/PB2N2R/Pk1p4/3Pp3/4P3/1K1Q4 w - - 0 1)

Valuska, Jan

3rd HM., Pravda TT, 1969

2R5/1pB1pN2/pP2P3/PB2N2R/Pk1p4/3Pp3/4P3/1K1Q4

#2

14 + 6

6490 yacpdb 2011

SOLUTION

  • SOUND
  • Sets
    • 1...Kc3
      • 2.Bd6#
    • 1...Kxa5
      • 2.Qe1#
    • 1...Kc5
      • 2.Sc6#
  • Tries
    • 1.Ka2?
      • 1...Kc3
        • 2.Bd6#
      • 1...Kxa5
        • 2.Qe1#
      • 1...Kc5
        • 2.Sc6#
      • 1...axb5!
    • 1.Kb2?
      • 1...Kxa5
        • 2.Qe1#
      • 1...Kc5
        • 2.Sc6#
      • 1...axb5!
    • 1.Bd7?
      • 1...Kc3
        • 2.Bd6#
      • 1...Kxa5
        • 2.Sc6#
        • 2.Qe1#
      • 1...Kc5
        • 2.Sc6#
      • 1...Ka3!
    • 1.Be8?
      • 1...Kc3
        • 2.Bd6#
      • 1...Kxa5
        • 2.Sc6#
        • 2.Qe1#
      • 1...Kc5
        • 2.Sc6#
      • 1...Ka3!
    • 1.Bd6+?
      • 1...Kxa5
        • 2.Sc4#
      • 1...exd6!
    • 1.Bd8?
      • 1...Ka3
        • 2.Bxe7#
      • 1...Kxa5
        • 2.Qe1#
      • 1...axb5!
    • 1.Qb3+?
      • 1...Kxa5
        • 2.Sc4#
      • 1...Kc5
        • 2.Sf3#
        • 2.Sc4#
        • 2.Sg4#
        • 2.Sc6#
        • 2.Sg6#
        • 2.Sd7#
        • 2.Bd6#
        • 2.Bb8#
        • 2.Bd8#
        • 2.Qc4#
      • 1...Kxb3!
    • 1.Qc1?
      • 1...Kb3
        • 2.Qb2#
      • 1...Kxa5
        • 2.Qe1#
      • 1...axb5!
    • 1.Qd2+?
      • 1...Ka3
        • 2.Qb2#
      • 1...Kb3
        • 2.Qb2#
      • 1...Kc5
        • 2.Sf3#
        • 2.Sc4#
        • 2.Sg4#
        • 2.Sc6#
        • 2.Sg6#
        • 2.Sd7#
      • 1...exd2!
  • Keys
    • 1.Bc4!
      • 1...Ka3
        • 2.Qb3#
      • 1...Kc3
        • 2.Qe1#
      • 1...Kxa5
        • 2.Sc6#
      • 1...Kc5
        • 2.Bd6#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 3
    • ADDED MATES = 1
    • REMOVED MATES = 0
  • Sets
    • K(b);S_FLIGHT::R(N)+B(L)
    • K(b);S_FLIGHT,XP(F)::QAB(B)
    • K(b);S_FLIGHT::R(I)+S(H)
  • Tries
    • Try
      • K(A);S_FLIGHT
      • Vars
        • K(b);S_FLIGHT::R(N)+B(L)
        • K(b);S_FLIGHT,XP(F)::QAB(B)
        • K(b);S_FLIGHT::R(I)+S(H)
      • Refutation
        • P(d);XB(G)
    • Try
      • K(A);P-FLIGHT
      • Vars
        • K(b);S_FLIGHT,XP(F)::QAB(B)
        • K(b);S_FLIGHT::R(I)+S(H)
      • Refutation
        • P(d);XB(G)
    • Try
      • B(G);
      • Vars
        • K(b);S_FLIGHT::R(N)+B(L)
        • K(b);S_FLIGHT::R(I)+S(H)
      • Refutation
        • K(b);S_FLIGHT
    • Try
      • B(G);
      • Vars
        • K(b);S_FLIGHT::R(N)+B(L)
        • K(b);S_FLIGHT::R(I)+S(H)
      • Refutation
        • K(b);S_FLIGHT
    • Try
      • B(L);CHECK
      • Vars
        • K(b);S_FLIGHT,XP(F)::S(H)
      • Refutation
        • P(f);XB(L)
    • Try
      • B(L);
      • Vars
        • K(b);S_FLIGHT::B(L),XP(f)
        • K(b);S_FLIGHT,XP(F)::QAB(B)
      • Refutation
        • P(d);XB(G)
    • Try
      • Q(B);CHECK
      • Vars
        • K(b);S_FLIGHT,XP(F)::S(H)
      • Refutation
        • K(b);P-FLIGHT,XQ(B)
    • Try
      • Q(B);
      • Vars
        • K(b);P-FLIGHT::QAR1(B)
        • K(b);S_FLIGHT,XP(F)::QAB(B)
      • Refutation
        • P(d);XB(G)
    • Try
      • Q(B);CHECK
      • Vars
        • K(b);S_FLIGHT::QAB1(B)
        • K(b);P-FLIGHT::QAR1(B)
      • Refutation
        • P(a);XQ(B)
  • Actual
    • B(G);
    • Vars
      • K(b);S_FLIGHT::QAR1(B)
      • K(b);S_FLIGHT::QAB(B)
      • K(b);S_FLIGHT,XP(F)::R(I)+S(H),DCHECK
      • K(b);S_FLIGHT::R(N)+B(L),DCHECK
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