MESON Chess Problem Database

Problem Display
PID: 235577 (K7/8/3P4/nRQ5/4pkP1/6qn/3R4/3B3N w - - 0 1)

Makaronets, Leonid

Shakhmaty v SSSR, 1972

K7/8/3P4/nRQ5/4pkP1/6qn/3R4/3B3N

#2

8 + 5

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Qe3
      • 2.Qe5#
      • 2.Qf5#
    • 1...Sg1
      • 2.Qg5#
    • 1...Sf2
      • 2.Qg5#
    • 1...Sg5
      • 2.Qxg5#
    • 1...e3
      • 2.Rd4#
      • 2.Qd4#
      • 2.Qe5#
      • 2.Qf5#
  • Tries
    • 1.Sxg3?
      • threat
        • 2.Sh5#
      • 1...e3
        • 2.Qe5#
      • 1...Kxg3!
    • 1.Rd3?
      • threat
        • 2.Qe5#
        • 2.Qf5#
      • 1...Qxg4
        • 2.Qe3#
        • 2.Qe5#
      • 1...exd3
        • 2.Qd4#
        • 2.Qe5#
      • 1...Qf3
        • 2.Qf5#
      • 1...Sc4
        • 2.Qf5#
      • 1...Sc6
        • 2.Qf5#
      • 1...Qxd3!
    • 1.Qe3+?
      • 1...Qxe3
        • 2.Rf5#
      • 1...Kxe3!
    • 1.Qc1?
      • threat
        • 2.Rf2#
      • 1...Ke3
        • 2.Rdd5#
      • 1...Qf2
        • 2.Rxf2#
      • 1...Qe3
        • 2.Rf5#
      • 1...Sf2
        • 2.Rxf2#
      • 1...e3
        • 2.Rd4#
      • 1...Qf3!
  • Keys
    • 1.Re2!
      • threat
        • 2.Qf5#
      • 1...Kf3
        • 2.Rf2#
      • 1...Kxg4
        • 2.Rxe4#
      • 1...Qxg4
        • 2.Qe3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 3
  • Sets
    • S(b);N_GUARD::QAB1(F)
    • S(b);N_GUARD::QAB1(F),XS(b)
  • Tries
    • Try
      • S(B);XQ(a)
      • Threat
        • S(B)
      • Vars
        • P(c);::QAB1(F)
      • Refutation
        • K(d);S_FLIGHT,XS(B)
    • Try
      • R(C);
      • Threat
        • DUALS(2)
      • Vars
        • Q(a);::QAR1(F)
        • S(e);::QAR1(F)
      • Refutation
        • Q(a);XR(C)
    • Try
      • Q(F);CHECK
      • Vars
        • Q(a);SBLOCK,XQ(F)::R1(E)
      • Refutation
        • K(d);S_FLIGHT,XQ(F)
    • Try
      • Q(F);
      • Threat
        • QAB(F)+R(C),DCHECK
      • Vars
        • K(d);S_FLIGHT::QAB(F)+R(C)
        • Q(a);::QAB(F)+R(C),DCHECK,XQ(a)
        • Q(a);SBLOCK::R1(E)
        • S(b);::QAB(F)+R(C),DCHECK,XS(b)
        • P(c);S_CUTQ(a)::R(C)
      • Refutation
        • Q(a);
  • Actual
    • R(C);
    • Threat
      • QAR1(F)
    • Vars
      • K(d);P-FLIGHT::B(A)+R(C),DCHECK
      • K(d);P-FLIGHT,XP(D)::B(A)+R(C),DCHECK,XP(c)
      • Q(a);N_GUARD,SBLOCK,XP(D)::QAB1(F)
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