MESON Chess Problem Database

Problem Display
PID: 259545 (8/1B4Bn/1KR3P1/3k4/2p1p3/p4n2/3P4/3Q4 w - - 0 1)

Isaev, Leonid Antonovich

Vecherni Moskva, 1933

(First published on Mon Feb 13 1933)

8/1B4Bn/1KR3P1/3k4/2p1p3/p4n2/3P4/3Q4

#2

7 + 6

15239 Valois Notebooks 2022

SOLUTION

  • SOUND
  • Sets
    • 1...Sxd2
      • 2.Qxd2#
    • 1...c3
      • 2.Qb3#
    • 1...e3
      • 2.Qxf3#
  • Tries
    • 1.Rf6+?
      • 1...Kd4
        • 2.Rd6#
      • 1...Ke5!
    • 1.d3?
      • threat
        • 2.dxc4#
      • 1...cxd3
        • 2.Qb3#
      • 1...exd3
        • 2.Qxf3#
      • 1...c3
        • 2.Qb3#
      • 1...e3
        • 2.Qxf3#
      • 1...Sf6!
    • 1.d4?
      • threat
        • 2.Rf6#
      • 1...Sxd4
        • 2.Qxd4#
      • 1...cxd4 ep
        • 2.Qb3#
      • 1...exd4 ep
        • 2.Qxf3#
      • 1...Se5
        • 2.dxe5#
      • 1...Sf6
        • 2.Rxf6#
      • 1...c3
        • 2.Qb3#
      • 1...Sd2!
  • Keys
    • 1.Qa1!
      • threat
        • 2.Rf6#
      • 1...Sd4
        • 2.Qxd4#
      • 1...Se5
        • 2.Qxe5#
      • 1...Sf6
        • 2.Rxf6#
      • 1...c3
        • 2.Qa2#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 3
    • REMOVED MATES = 2
  • Sets
    • S(b);OGATE,P_SPINS(b),XP(B)::QAR(A),XS(b)
    • P(c);OGATEB::QAB(A)
    • P(d);OGATEB::QAB(A),XS(b)
  • Tries
    • Try
      • R(D);CHECK
      • Vars
        • K(e);N_GUARD,P-FLIGHT::B(G)+R(D),DCHECK
      • Refutation
        • K(e);P-FLIGHT
    • Try
      • P(B);
      • Threat
        • QAR(A)+P(B)DCHECK,XP(c)
      • Vars
        • P(c);OGATEB,P_SPINP(c),XP(B)::QAB(A)
        • P(d);OGATEB,P_SPINP(d),XP(B)::QAB(A),XS(b)
        • P(c);OGATEB::QAB(A)
        • P(d);OGATEB::QAB(A),XS(b)
      • Refutation
        • S(f);
    • Try
      • P(B);
      • Threat
        • B(F)+R(D)
      • Vars
        • S(b);OGATE,P_SPINS(b),XP(B)::QAR1(A),XS(b)
        • P(c);EP,OGATEB,P_SPINP(c),XP(B)::QAB(A)
        • P(d);EP,OGATEB,P_SPINP(d),XP(B)::QAB(A),XS(b)
        • S(b);OGATE::QAR(A)+P(B),XS(b)
        • S(f);::B(F)+R(D),XS(f)
        • P(c);OGATEB::QAB(A)
      • Refutation
        • S(b);
  • Actual
    • Q(A);
    • Threat
      • B(F)+R(D)
    • Vars
      • S(b);N_GUARD::QAR1(A),XS(b)
      • S(f);::B(F)+R(D),XS(f)
      • P(c);OGATEB::QAB(A)
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