MESON Chess Problem Database

Problem Display
PID: 245799 (8/B7/1Np2Kp1/8/3k2p1/1p2NP2/1P2B2R/2qnQ3 w - - 0 1)

Makaronets, Leonid

Schweizerische Schachzeitung, 1993

8/B7/1Np2Kp1/8/3k2p1/1p2NP2/1P2B2R/2qnQ3

#2

9 + 7

5454 Near Snap 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Kxe3
      • 2.Sd5#
    • 1...Kc5
      • 2.Sc8#
    • 1...Qxe3
      • 2.Qb4#
    • 1...Qc5
      • 2.Qd2#
  • Tries
    • 1.Sf5+?
      • 1...Kc5
        • 2.Qa5#
      • 1...gxf5!
    • 1.Sa4+?
      • 1...Qc5
        • 2.Bxc5#
        • 2.Qd2#
      • 1...c5!
    • 1.Sbd5+?
      • 1...Qc5
        • 2.Qd2#
        • 2.Qb4#
        • 2.Qxd1#
      • 1...c5!
    • 1.Sd7+?
      • 1...Qc5
        • 2.Bxc5#
        • 2.Qd2#
      • 1...c5!
    • 1.Sa8+?
      • 1...Qc5
        • 2.Qd2#
      • 1...c5!
    • 1.Sc8+?
      • 1...Qc5
        • 2.Qd2#
      • 1...c5!
    • 1.Qd2+?
      • 1...Kc5
        • 2.Sa4#
        • 2.Sd7#
        • 2.Sa8#
        • 2.Sc8#
      • 1...Qxd2!
    • 1.Qb4+?
      • 1...Kxe3
        • 2.Sd5#
      • 1...Qc4!
    • 1.Qa5?
      • threat
        • 2.Qe5#
      • 1...Kxe3
        • 2.Sd5#
      • 1...Qxe3
        • 2.Qb4#
      • 1...Qc5
        • 2.Qd2#
      • 1...c5!
  • Keys
    • 1.Qg3!
      • threat
        • 2.Qe5#
      • 1...Kxe3
        • 2.Sc4#
      • 1...Kc5
        • 2.Sbd5#
      • 1...Qxe3
        • 2.Qd6#
      • 1...Qc5
        • 2.Qf4#

Anticipated by 61184(1942), 97940(1953), 157602(1984)

FEATURES

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