MESON Chess Problem Database

Problem Display
PID: 65921 (4R3/3PB3/1P1P4/2P3NR/P2kBp2/P1N2Pp1/6P1/3K1Q2 w - - 0 1)

Retter, Yosef

4th HM., Pravda TT, 1969

4R3/3PB3/1P1P4/2P3NR/P2kBp2/P1N2Pp1/6P1/3K1Q2

#2

16 + 3

SOLUTION

  • SOUND
  • Sets
    • 1...Ke3
      • 2.Qg1#
  • Tries
    • 1.Sb5+?
      • 1...Ke3
        • 2.Qe2#
        • 2.Qe1#
        • 2.Qg1#
      • 1...Ke5
        • 2.Bd8#
      • 1...Kxc5!
    • 1.Sd5?
      • threat
        • 2.Se6#
      • 1...Ke5
        • 2.Bf6#
      • 1...Kxc5!
    • 1.Sh3?
      • threat
        • 2.Qd3#
      • 1...Ke3
        • 2.Qd3#
        • 2.Qg1#
      • 1...Kxc3!
    • 1.Se6+?
      • 1...Ke3
        • 2.Sd5#
        • 2.Qe2#
        • 2.Qe1#
        • 2.Qg1#
      • 1...Kxc3!
    • 1.Sf7?
      • threat
        • 2.Qd3#
      • 1...Ke3
        • 2.Qg1#
      • 1...Kxc3!
    • 1.Sh7?
      • threat
        • 2.Qd3#
      • 1...Ke3
        • 2.Qg1#
      • 1...Kxc3!
    • 1.Bf6+?
      • 1...Ke3
        • 2.Sd5#
        • 2.Bb1#
        • 2.Bc2#
        • 2.Bd3#
        • 2.Bd5#
        • 2.Bf5#
        • 2.Bc6#
        • 2.Bg6#
        • 2.Bb7#
        • 2.Bh7#
        • 2.Ba8#
        • 2.Qe2#
        • 2.Qe1#
        • 2.Qg1#
      • 1...Kxc5!
    • 1.Qd3+?
      • 1...Ke5
        • 2.Bd8#
        • 2.Qd5#
      • 1...Kxc5!
    • 1.d8Q?
      • 1...Ke3
        • 2.Qg1#
      • 1...Kxc5
        • 2.Se6#
      • 1...Ke5
        • 2.Bf6#
      • 1...Kxc3!
    • 1.d8B?
      • 1...Ke3
        • 2.Qg1#
      • 1...Kxc5
        • 2.Se6#
      • 1...Ke5
        • 2.Bf6#
      • 1...Kxc3!
  • Keys
    • 1.Bd5!
      • 1...Kxc3
        • 2.Bf6#
      • 1...Ke3
        • 2.Bf6#
      • 1...Kxc5
        • 2.Qg1#
      • 1...Ke5
        • 2.Se6#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 1
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • K(b);S_FLIGHT::QAB(B)
  • Tries
    • Try
      • S(E);CHECK
      • Vars
        • K(b);S_FLIGHT::R(P)+B(O)
      • Refutation
        • K(b);S_FLIGHT,XP(I)
    • Try
      • S(E);
      • Threat
        • S(J)
      • Vars
        • K(b);S_FLIGHT::R(P)+B(O),DCHECK
      • Refutation
        • K(b);S_FLIGHT,XP(I)
    • Try
      • S(J);
      • Threat
        • QAR1(B)
      • Refutation
        • K(b);S_FLIGHT,XS(E)
    • Try
      • S(J);CHECK
      • Refutation
        • K(b);S_FLIGHT,XS(E)
    • Try
      • S(J);
      • Threat
        • QAR1(B)
      • Vars
        • K(b);S_FLIGHT::QAB(B)
      • Refutation
        • K(b);S_FLIGHT,XS(E)
    • Try
      • S(J);
      • Threat
        • QAR1(B)
      • Vars
        • K(b);S_FLIGHT::QAB(B)
      • Refutation
        • K(b);S_FLIGHT,XS(E)
    • Try
      • B(O);CHECK
      • Refutation
        • K(b);S_FLIGHT,XP(I)
    • Try
      • Q(B);CHECK
      • Refutation
        • K(b);S_FLIGHT,XP(I)
    • Try
      • P(N);
      • Vars
        • K(b);S_FLIGHT::QAB(B)
        • K(b);S_FLIGHT,XP(I)::R(K)+S(J),DCHECK
        • K(b);S_FLIGHT::R(P)+B(O),DCHECK
      • Refutation
        • K(b);S_FLIGHT,XS(E)
    • Try
      • P(N);
      • Vars
        • K(b);S_FLIGHT::QAB(B)
        • K(b);S_FLIGHT,XP(I)::R(K)+S(J),DCHECK
        • K(b);S_FLIGHT::R(P)+B(O),DCHECK
      • Refutation
        • K(b);S_FLIGHT,XS(E)
  • Actual
    • B(H);
    • Vars
      • K(b);S_FLIGHT,XS(E)::B(O)
      • K(b);S_FLIGHT::R(P)+B(O)
      • K(b);S_FLIGHT,XP(I)::QAB(B)
      • K(b);S_FLIGHT::R(K)+S(J)
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