MESON Chess Problem Database

Problem Display
PID: 238508 (4K3/B2p2N1/2PRp3/1P2kp2/4N3/8/8/6Q1 w - - 0 1)

Shtern, David

Variantim, 2020

4K3/B2p2N1/2PRp3/1P2kp2/4N3/8/8/6Q1

#2

8 + 4

SOLUTION

  • SOUND
  • Sets
    • 1...Kxe4
      • 2.Qe3#
    • 1...f4
      • 2.Qd4#
  • Tries
    • 1.Kxd7?
      • 1...Kxe4
        • 2.Qe3#
      • 1...fxe4
        • 2.Qg5#
      • 1...f4
        • 2.Qd4#
      • 1...Kf4!
    • 1.Sc3?
      • threat
        • 2.Qd4#
      • 1...Kxd6
        • 2.Bb8#
      • 1...Kf6
        • 2.Bd4#
      • 1...Kf4!
    • 1.Sh5?
      • threat
        • 2.Qd4#
      • 1...Kxe4
        • 2.Qe3#
      • 1...fxe4
        • 2.Qc5#
      • 1...f4!
    • 1.Bd4+?
      • 1...Kxe4
        • 2.Qe3#
      • 1...Kf4!
    • 1.Rd4?
      • 1...Kf4
        • 2.Qg3#
      • 1...fxe4
        • 2.Qg5#
      • 1...dxc6
        • 2.Bb8#
      • 1...f4
        • 2.Qg5#
      • 1...d5
        • 2.Bb8#
      • 1...d6!
    • 1.Rxe6+?
      • 1...Kf4
        • 2.Qg3#
      • 1...Kd5
        • 2.Qd4#
        • 2.Qc5#
      • 1...dxe6!
    • 1.Rxd7?
      • 1...Kxe4
        • 2.Qe3#
      • 1...fxe4
        • 2.Qg5#
      • 1...f4
        • 2.Qd4#
      • 1...Kf4!
    • 1.Qc5+?
      • 1...Kxe4
        • 2.Qe3#
      • 1...Kf4!
    • 1.Qg3+?
      • 1...Kxe4
        • 2.Rd4#
        • 2.Qe3#
      • 1...f4!
    • 1.Qg5?
      • 1...Kxe4
        • 2.Qe3#
      • 1...dxc6!
  • Keys
    • 1.Sf6!
      • threat
        • 2.Qd4#
      • 1...Kf4
        • 2.Qe3#
      • 1...Kxd6
        • 2.Bb8#
      • 1...Kxf6
        • 2.Bd4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 2
  • Sets
    • K(a);OGATEB,P-FLIGHT,XS(B)::QAR1(A)
    • P(b);SBLOCK::QAB1(A)
  • Tries
    • Try
      • K(H);S_FLIGHT,XP(d)
      • Vars
        • K(a);OGATEB,P-FLIGHT,XS(B)::QAR1(A)
        • P(b);OGATEB,SBLOCK,XS(B)::QAR2(A)
        • P(b);SBLOCK::QAB1(A)
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • S(B);
      • Threat
        • QAB1(A)
      • Vars
        • K(a);OGATEB,S_FLIGHT,XR(E)::B(F)
        • K(a);P_SPINP(c),S_FLIGHT::B(F)
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • S(G);
      • Threat
        • QAB1(A)
      • Vars
        • K(a);OGATEB,P-FLIGHT,XS(B)::QAR1(A)
        • P(b);SBLOCK,XS(B)::QAR2(A)
      • Refutation
        • P(b);
    • Try
      • B(F);CHECK
      • Vars
        • K(a);P-FLIGHT,XS(B)::QAR1(A)
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • R(E);
      • Vars
        • K(a);S_FLIGHT::QAB1(A)
        • P(b);OGATEB,XS(B)::QAR2(A)
        • P(d);N_GUARD,XP(D)::B(F)
        • P(b);OGATEB::QAR2(A)
        • P(d);N_GUARD::B(F)
      • Refutation
        • P(d);
    • Try
      • R(E);CHECK,XP(c)
      • Vars
        • K(a);S_FLIGHT::QAB1(A)
      • Refutation
        • P(d);XR(E)
    • Try
      • R(E);XP(d)
      • Vars
        • K(a);OGATEB,P-FLIGHT,XS(B)::QAR1(A)
        • P(b);OGATEB,SBLOCK,XS(B)::QAR2(A)
        • P(b);SBLOCK::QAB1(A)
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • Q(A);CHECK
      • Vars
        • K(a);OGATEB,P-FLIGHT,XS(B)::QAR1(A)
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • Q(A);CHECK
      • Refutation
        • P(b);P_SPINP(b)
    • Try
      • Q(A);P_PINP(b)
      • Vars
        • K(a);N_SPINP(b),OGATEB,P-FLIGHT,XS(B)::QAR1(A)
      • Refutation
        • P(d);XP(D)
  • Actual
    • S(B);
    • Threat
      • QAB1(A)
    • Vars
      • K(a);S_FLIGHT::QAB1(A)
      • K(a);OGATEB,S_FLIGHT,XR(E)::B(F)
      • K(a);P_SPINP(c),S_FLIGHT,XS(B)::B(F)
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