MESON Chess Problem Database

Problem Display
PID: 270643 (4N3/2p5/8/3k4/K3R3/4B3/8/7Q w - - 0 1)

Koshel, Mikhail Igorevich

Shakhmatnaya kompozitsiya, 2020

4N3/2p5/8/3k4/K3R3/4B3/8/7Q

#2

5 + 2

SOLUTION

  • SOUND
  • Sets
    • 1...Kc6
      • 2.Re7#
  • Tries
    • 1.Kb4?
      • threat
        • 2.Re7#
      • 1...Kc6
        • 2.Re7#
      • 1...c5+!
    • 1.Sf6+?
      • 1...Kc6
        • 2.Re6#
      • 1...Kd6!
    • 1.Rb4+?
      • 1...Ke5
        • 2.Qe4#
      • 1...Ke6!
    • 1.Rd4+?
      • 1...Kc5
        • 2.Rb4#
        • 2.Rf4#
        • 2.Rg4#
        • 2.Rh4#
      • 1...Ke5
        • 2.Qe4#
        • 2.Qd5#
      • 1...Ke6!
    • 1.Rf4+?
      • 1...Ke5
        • 2.Qe4#
      • 1...Ke6!
    • 1.Rg4+?
      • 1...Ke5
        • 2.Qe4#
      • 1...Ke6!
    • 1.Rh4+?
      • 1...Ke5
        • 2.Qe4#
      • 1...Ke6!
    • 1.Qf3?
      • 1...Kc6
        • 2.Re7#
      • 1...c6
        • 2.Qf5#
      • 1...c5!
    • 1.Qh5+?
      • 1...Kc6
        • 2.Qb5#
      • 1...Kxe4!
    • 1.Qh7?
      • 1...c5
        • 2.Qb7#
      • 1...c6
        • 2.Qf5#
      • 1...Kc6!
  • Keys
    • 1.Qb1!
      • 1...Kc6
        • 2.Qb5#
      • 1...c5
        • 2.Qb7#
      • 1...c6
        • 2.Qd3#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 1
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • K(a);N_GUARD,S_FLIGHT::QAB(A)+R(D)
  • Tries
    • Try
      • K(C);P-FLIGHT
      • Threat
        • QAB(A)+R(D)
      • Vars
        • K(a);S_FLIGHT::QAB(A)+R(D)
      • Refutation
        • P(b);CHECK
    • Try
      • S(E);CHECK
      • Vars
        • K(a);N_GUARD,S_FLIGHT::QAB(A)+R(D),DCHECK
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • R(D);CHECK
      • Vars
        • K(a);P-FLIGHT::QAR1(A)
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • R(D);CHECK
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • R(D);CHECK
      • Vars
        • K(a);P-FLIGHT::QAR1(A)
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • R(D);CHECK
      • Vars
        • K(a);P-FLIGHT::QAR1(A)
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • R(D);CHECK
      • Vars
        • K(a);P-FLIGHT::QAR1(A)
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • Q(A);
      • Vars
        • K(a);N_GUARD,S_FLIGHT::QAB(A)+R(D)
        • P(b);SBLOCK::QAR2(A)
      • Refutation
        • P(b);
    • Try
      • Q(A);CHECK
      • Vars
        • K(a);OGATE,S_FLIGHT::QAB1(A)
      • Refutation
        • K(a);S_FLIGHT,XR(D)
    • Try
      • Q(A);
      • Vars
        • P(b);OGATE::QAB(A)
        • P(b);SBLOCK::QAR2(A)
      • Refutation
        • K(a);S_FLIGHT
  • Actual
    • Q(A);
    • Vars
      • K(a);N_GUARD,S_CUTP(b),S_FLIGHT::QAB1(A)
      • P(b);N_GUARD::QAB(A)
      • P(b);SBLOCK::QAR2(A)
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