MESON Chess Problem Database

Problem Display
PID: 87920 (KB6/1BR4r/p7/3NPP1p/1P1kp2Q/1P1pN3/1P1R4/2q1r3 w - - 0 1)

Erokhin, Vladimir Alekseevich

Uralski Problemist, 1998

KB6/1BR4r/p7/3NPP1p/1P1kp2Q/1P1pN3/1P1R4/2q1r3

#2

13 + 8

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Kxe5
      • 2.Qf6#
    • 1...Qxb2
      • 2.Rc4#
    • 1...Qxd2
      • 2.Rc4#
    • 1...Qa1
      • 2.Rc4#
    • 1...Qb1
      • 2.Rc4#
    • 1...Qd1
      • 2.Rc4#
    • 1...Qc4
      • 2.Rxc4#
  • Tries
    • 1.Sc2+?
      • 1...Kxe5
        • 2.Rf7#
        • 2.Qf6#
        • 2.Qf4#
      • 1...Qxc2!
    • 1.Se7?
      • threat
        • 2.Qxe4#
      • 1...Kxe3
        • 2.Qf2#
      • 1...Kxe5
        • 2.Rc4#
      • 1...Rxe3
        • 2.Rd7#
      • 1...Qc6!
    • 1.Ba7+?
      • 1...Kxe5
        • 2.Qg3#
        • 2.Qf6#
        • 2.Qh2#
        • 2.Qf4#
      • 1...Qc5!
    • 1.Rxd3+?
      • 1...Kxe5
        • 2.Re7#
        • 2.Qg3#
        • 2.Qf6#
        • 2.Qh2#
        • 2.Qf4#
      • 1...Kxd3!
  • Keys
    • 1.Sc3!
      • threat
        • 2.Qxe4#
      • 1...Kxe3
        • 2.Qf2#
      • 1...Kxe5
        • 2.Rd7#
      • 1...Rxe3
        • 2.Rc4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 2
    • REMOVED MATES = 6
  • Sets
    • K(d);N_SPINP(c),OGATEB,S_FLIGHT,XP(H)::QAB1(F)
    • Q(a);N_GUARD,XP(A)::R1(K)
    • Q(a);N_GUARD,N_SPINP(c),P_SPINP(e),XR(B)::R1(K)
    • Q(a);N_GUARD::R1(K)
    • Q(a);N_GUARD::R1(K),XQ(a)
  • Tries
    • Try
      • S(D);CHECK
      • Refutation
        • Q(a);XS(D)
    • Try
      • S(G);
      • Threat
        • QAR1(F),XP(e)
      • Vars
        • K(d);N_SPINP(c),OGATEB,S_FLIGHT,XS(D)::QAB1(F)
        • K(d);N_SPINP(c),S_FLIGHT,XP(H)::B(M)+R(K)
        • R(b);SBLOCK,XS(D)::R(K)
      • Refutation
        • Q(a);P_PINB(J)
    • Try
      • B(M);CHECK
      • Refutation
        • Q(a);P_SPINQ(a)
    • Try
      • R(B);CHECK,P_PINP(e),XP(c)
      • Refutation
        • K(d);N_SPINP(e),P-FLIGHT,XR(B)
  • Actual
    • S(G);
    • Threat
      • QAR1(F),XP(e)
    • Vars
      • K(d);N_SPINP(c),OGATEB,S_FLIGHT,XS(D)::QAB1(F)
      • K(d);N_SPINP(c),S_FLIGHT,XP(H)::B(M)+R(K)
      • R(b);SBLOCK,XS(D)::R1(K)
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