MESON Chess Problem Database

Problem Display
PID: 86744 (1b2r3/3r1p2/8/1NB3Rp/1KRpkN2/4p3/p3Q3/8 w - - 0 1)

Kirillov, Valery Afanasievich

2nd HM., Uralski Skazi TT, 1990

1b2r3/3r1p2/8/1NB3Rp/1KRpkN2/4p3/p3Q3/8

#2

7 + 9

6490 yacpdb 2009
3713 Snap 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Ra7
      • 2.Rxd4#
    • 1...Rb7
      • 2.Rxd4#
    • 1...Rc7
      • 2.Rxd4#
    • 1...Rde7
      • 2.Rxd4#
    • 1...Bxf4
      • 2.Sc3#
    • 1...Bd6
      • 2.Rxd4#
  • Tries
    • 1.Sg2?
      • threat
        • 2.Sc3#
        • 2.Qxe3#
      • 1...Re5
        • 2.Sc3#
      • 1...Be5
        • 2.Sc3#
      • 1...a1Q
        • 2.Qxe3#
      • 1...a1B
        • 2.Qxe3#
      • 1...Rb7
        • 2.Rxd4#
        • 2.Qxe3#
      • 1...Bf4
        • 2.Sc3#
      • 1...f5!
    • 1.Sxd4?
      • threat
        • 2.Qf3#
      • 1...Rb7+
        • 2.Sb5#
      • 1...Kxf4
        • 2.Se6#
      • 1...Rxd4
        • 2.Rxd4#
      • 1...Bxf4
        • 2.Qc2#
      • 1...f5!
    • 1.Qd3+?
      • 1...Kxf4
        • 2.Qf5#
      • 1...Kf3!
    • 1.Qc2+?
      • 1...Kxf4
        • 2.Qf5#
      • 1...Kf3!
  • Keys
    • 1.Bxd4!
      • threat
        • 2.Qxe3#
      • 1...Bd6+
        • 2.Bc5#
      • 1...Kxf4
        • 2.Bxe3#
      • 1...Rxd4
        • 2.Rxd4#
      • 1...Bxf4
        • 2.Sc3#

Anticipated by 176522(1987)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 2
    • REMOVED MATES = 4
  • Sets
    • R(f);N_GUARD::R1(C),XP(c)
    • R(f);N_GUARD,P_PINS(E)::R1(C),XP(c)
    • B(h);SBLOCK,XS(D)::S(E)
    • B(h);P_PINB(F),S_CUTR(f)::R1(C),XP(c)
  • Tries
    • Try
      • S(D);
      • Threat
        • DUALS(2)
      • Vars
        • R(i);::S(E)
        • B(h);::S(E)
        • P(a);::QAR1(A),XP(b)
      • Refutation
        • P(g);
    • Try
      • S(E);XP(c)
      • Threat
        • QAB1(A)
      • Vars
        • R(f);CHECK,N_GUARD::R(C)+S(E)
        • K(d);N_SPINP(b),P-FLIGHT,XS(D)::R(C)+S(E),DCHECK
        • R(f);OGATE,P_PINR(C),P_SPINR(f),XS(E)::R1(C),XR(f)
        • B(h);SBLOCK,XS(D)::QAB(A)
      • Refutation
        • P(g);
    • Try
      • Q(A);CHECK,N_PINP(b),P_PINP(c)
      • Vars
        • K(d);OGATE,P-FLIGHT,XS(D)::QAR1(A)
      • Refutation
        • K(d);N_SPINP(c),P_SPINP(b),S_FLIGHT
    • Try
      • Q(A);CHECK,N_PINP(b),P_PINP(c)
      • Vars
        • K(d);OGATE,P-FLIGHT,XS(D)::QAR1(A)
      • Refutation
        • K(d);N_SPINP(c),S_FLIGHT
  • Actual
    • B(F);XP(c)
    • Threat
      • QAR1(A),XP(b)
    • Vars
      • B(h);CHECK,S_CUTR(f)::R(C)+B(F)
      • K(d);N_SPINP(b),P-FLIGHT,XS(D)::R(C)+B(F),DCHECK,XP(b)
      • R(f);OGATE,P_PINR(C),P_SPINR(f),XB(F)::R1(C),XR(f)
      • B(h);SBLOCK,XS(D)::S(E)
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