MESON Chess Problem Database

Problem Display
PID: 61184 (4B1bB/8/pK2pN1Q/5p1P/3k4/1PN2p2/1RP2P2/4q3 w - - 0 1)

Pituk, Alexander

4th HM., Source?, 1942

4B1bB/8/pK2pN1Q/5p1P/3k4/1PN2p2/1RP2P2/4q3

#2

11 + 7

4393 Uralski Problemist 2004
5454 Near Snap 2019

SOLUTION

  • SOUND
  • Sets
    • 1...Kxc3
      • 2.Sd5#
    • 1...Ke5
      • 2.Sfe4#
    • 1...Qxc3
      • 2.Qf4#
    • 1...Qa1
      • 2.Qe3#
    • 1...Qb1
      • 2.Qe3#
    • 1...Qd1
      • 2.Qe3#
    • 1...Qf1
      • 2.Qe3#
    • 1...Qg1
      • 2.Qe3#
    • 1...Qh1
      • 2.Qe3#
    • 1...Qe3
      • 2.Qxe3#
    • 1...Qe5
      • 2.Qd2#
  • Tries
    • 1.Se2+?
      • 1...Ke5
        • 2.Qf4#
      • 1...fxe2
        • 2.Qe3#
      • 1...Qxe2!
    • 1.Sg4+?
      • 1...Qe5
        • 2.Bxe5#
        • 2.Qd2#
        • 2.Qe3#
      • 1...e5!
    • 1.Sfd5+?
      • 1...Qe5
        • 2.Qd2#
        • 2.Qe3#
        • 2.Qf4#
      • 1...e5!
    • 1.Sd7+?
      • 1...Qe5
        • 2.Bxe5#
        • 2.Qd2#
        • 2.Qe3#
      • 1...e5!
    • 1.Sh7+?
      • 1...Qe5
        • 2.Qd2#
        • 2.Qe3#
      • 1...e5!
    • 1.Sxg8+?
      • 1...Qe5
        • 2.Qd2#
        • 2.Qe3#
      • 1...e5!
    • 1.Qd2+?
      • 1...Ke5
        • 2.Sfe4#
        • 2.Sg4#
        • 2.Sd7#
        • 2.Sh7#
        • 2.Sxg8#
      • 1...Qxd2!
    • 1.Qf4+?
      • 1...Kxc3
        • 2.Sd5#
      • 1...Qe4!
  • Keys
    • 1.Qf8!
      • threat
        • 2.Qc5#
      • 1...Kxc3
        • 2.Se4#
      • 1...Ke5
        • 2.Sfd5#
      • 1...Qxc3
        • 2.Qd6#
      • 1...Qe5
        • 2.Qb4#

This anticipates 97940(1953), 157602(1984), 245799(1993)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 4
    • ADDED MATES = 0
    • REMOVED MATES = 7
  • Sets
    • K(c);S_FLIGHT,XS(E)::B(K)+S(H),DCHECK
    • K(c);S_FLIGHT::B(K)+S(H)
    • Q(a);N_GUARD,SBLOCK,XS(E)::QAR2(I)
    • Q(a);N_GUARD::QAB1(I)
    • Q(a);N_GUARD::QAB1(I),XQ(a)
    • Q(a);N_GUARD,SBLOCK::QAR2(I)
  • Tries
    • Try
      • S(E);CHECK
      • Vars
        • K(c);S_FLIGHT::QAB1(I)
        • P(b);XS(E)::QAB1(I)
      • Refutation
        • Q(a);XS(E)
    • Try
      • S(H);CHECK
      • Refutation
        • P(f);P_SPINP(f)
    • Try
      • S(H);CHECK
      • Refutation
        • P(f);P_SPINP(f)
    • Try
      • S(H);CHECK
      • Refutation
        • P(f);P_SPINP(f)
    • Try
      • S(H);CHECK
      • Refutation
        • P(f);P_SPINP(f)
    • Try
      • S(H);CHECK,XB(g)
      • Refutation
        • P(f);P_SPINP(f)
    • Try
      • Q(I);CHECK
      • Refutation
        • Q(a);XQ(I)
    • Try
      • Q(I);CHECK
      • Vars
        • K(c);S_FLIGHT,XS(E)::B(K)+S(H),DCHECK
      • Refutation
        • Q(a);P_SPINQ(a)
  • Actual
    • Q(I);
    • Threat
      • QAB1(I)
    • Vars
      • K(c);S_FLIGHT,XS(E)::B(K)+S(H),DCHECK
      • K(c);S_FLIGHT::B(K)+S(H)
      • Q(a);SBLOCK,XS(E)::QAR2(I)
      • Q(a);SBLOCK::QAR2(I)
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