MESON Chess Problem Database

Problem Display
PID: 63517 (b7/1n2r3/1K1pN2R/3pkP2/pB1p4/3Bq1P1/rP2QR2/8 w - - 0 1)

Zalokotsky, Roman Fedorovich (aka Fedorovich, Roman)

3rd Prize, Schach, 1976

b7/1n2r3/1K1pN2R/3pkP2/pB1p4/3Bq1P1/rP2QR2/8

#2

10 + 10

3771 FIDE Album (1974-1976) 1980
5454 Near Snap 2022

SOLUTION

  • SOUND
  • Sets
    • 1...Qxe2
      • 2.Rxe2#
    • 1...Rxe6
      • 2.Rxe6#
  • Tries
    • 1.Sg5?
      • threat
        • 2.Sf3#
      • 1...Qxe2
        • 2.Rxe2#
      • 1...Qe4!
    • 1.Sd8?
      • threat
        • 2.Sc6#
      • 1...Sxd8
        • 2.Bxd6#
      • 1...Rc7
        • 2.Re6#
      • 1...Sa5
        • 2.Bxd6#
      • 1...Sc5!
    • 1.Bc3?
      • threat
        • 2.Bxd4#
        • 2.Qxe3#
      • 1...dxc3+
        • 2.Qxe3#
      • 1...Qxe2
        • 2.Bxd4#
        • 2.Rxe2#
      • 1...Rxe6
        • 2.Rxe6#
        • 2.Qxe3#
      • 1...Qe4
        • 2.Bxd4#
      • 1...Sc5
        • 2.Bxd4#
      • 1...Rxb2+!
  • Keys
    • 1.Sxd4!
      • threat
        • 2.Qxe3#
      • 1...Kxd4
        • 2.Bc3#
      • 1...Qxe2
        • 2.Sc6#
      • 1...Qe4
        • 2.Sc6#
      • 1...Sc5
        • 2.Sf3#

This anticipates 153402(1994)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 3
    • REMOVED MATES = 1
  • Sets
    • Q(b);N_SPINQ(b),OGATE,XQ(B)::R(C),XQ(b)
    • R(i);OGATE,XS(I)::R1(J),XR(i)
  • Tries
    • Try
      • S(I);
      • Threat
        • S(I)
      • Vars
        • Q(b);N_SPINQ(b),OGATE,XQ(B)::R(C),XQ(b)
      • Refutation
        • Q(b);
    • Try
      • S(I);
      • Threat
        • S(I)
      • Vars
        • S(h);N_GUARD,XS(I)::B(F),XP(g)
        • R(i);N_GUARD::R1(J)
        • S(h);N_GUARD::B(F),XP(g)
      • Refutation
        • S(h);
    • Try
      • B(F);P_PINP(d)
      • Threat
        • DUALS(2)
      • Vars
        • P(d);CHECK,N_SPINP(d),XB(F)::QAR2(B),XQ(b)
        • Q(b);::B(F),XP(d)
        • S(h);::B(F),XP(d)
      • Refutation
        • R(a);CHECK,XP(A)
  • Actual
    • S(I);P_SPINS(I),XP(d)
    • Threat
      • QAR2(B),XQ(b)
    • Vars
      • K(f);N_SPINQ(b),OGATEB,S_FLIGHT,XS(I)::B(F)
      • Q(b);N_PINS(I),N_SPINQ(b),XQ(B)::S(I)
      • Q(b);N_PINS(I)::S(I)
      • S(h);N_PINS(I)::S(I)
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