MESON Chess Problem Database

Problem Display
PID: 242166 (8/8/2P3p1/3pp1r1/1N2k1nR/7p/2P1nQNP/q3RK1B w - - 0 1)

Gavrilov, Constantin Grigorievich

Brisbane Courier, 1927

8/8/2P3p1/3pp1r1/1N2k1nR/7p/2P1nQNP/q3RK1B

#2

10 + 9

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Qb2
      • 2.Rxe2#
    • 1...Qd4
      • 2.Se3#
    • 1...Qxe1+
      • 2.Sxe1#
    • 1...Qa2
      • 2.Rxe2#
    • 1...Qa4
      • 2.Rxe2#
    • 1...Qa5
      • 2.Rxe2#
    • 1...Qa8
      • 2.Rxe2#
    • 1...Rf5
      • 2.Sf4#
    • 1...Rh5
      • 2.Rxg4#
    • 1...hxg2+
      • 2.Bxg2#
    • 1...d4
      • 2.Se3#
  • Tries
    • 1.Sd3?
      • threat
        • 2.Sc5#
      • 1...Qxe1+
        • 2.Sgxe1#
      • 1...hxg2+
        • 2.Bxg2#
      • 1...d4
        • 2.Se3#
      • 1...Qc3
        • 2.Rxe2#
      • 1...Qd4
        • 2.Se3#
      • 1...Qa3
        • 2.Rxe2#
      • 1...Qa5
        • 2.Rxe2#
      • 1...Qa7!
    • 1.Sxd5?
      • threat
        • 2.Sf6#
      • 1...Qxe1+
        • 2.Sxe1#
      • 1...hxg2+
        • 2.Bxg2#
      • 1...Rf5
        • 2.Sgf4#
      • 1...Kxd5!
    • 1.c3?
      • threat
        • 2.Se3#
      • 1...Qxe1+
        • 2.Sxe1#
      • 1...hxg2+
        • 2.Bxg2#
      • 1...Rf5
        • 2.Sf4#
      • 1...Qxc3!
  • Keys
    • 1.Sa2!
      • 1...Qxe1+
        • 2.Sxe1#
      • 1...hxg2+
        • 2.Bxg2#
      • 1...Qxa2
        • 2.Rxe2#
      • 1...d4
        • 2.Se3#
      • 1...Qb2
        • 2.Rxe2#
      • 1...Qc3
        • 2.Sxc3#
      • 1...Qd4
        • 2.Se3#
      • 1...Qb1
        • 2.Sc3#
      • 1...Qc1
        • 2.Sc3#
      • 1...Qd1
        • 2.Sc3#
      • 1...Rf5
        • 2.Sf4#
      • 1...Rh5
        • 2.Rxg4#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 3
  • Sets
    • Q(a);N_PINR(A)::R(A),XS(b)
    • Q(a);N_PINR(A),SBLOCK::B(C)+S(F)
    • Q(a);CHECK,N_SPINS(b),P_SPINS(e),XR(A)::B(C)+S(F),XQ(a)
    • R(h);P_PINQ(E),SBLOCK::B(C)+S(F)
    • R(h);N_GUARD::R(I),XS(e)
    • P(c);CHECK,OGATE,P_SPINP(c),XS(F)::B(C),XP(c)
    • P(f);SBLOCK::B(C)+S(F)
  • Tries
    • Try
      • S(H);
      • Threat
        • S(H)
      • Vars
        • Q(a);CHECK,N_SPINS(b),P_SPINS(e),XR(A)::B(C)+S(F),XQ(a)
        • P(c);CHECK,OGATE,P_SPINP(c),XS(F)::B(C),XP(c)
        • P(f);SBLOCK::B(C)+S(F)
        • Q(a);N_PINR(A)::R(A),XS(b)
        • Q(a);N_PINR(A),SBLOCK::B(C)+S(F)
      • Refutation
        • Q(a);N_PINR(A)
    • Try
      • S(H);XP(f)
      • Threat
        • S(H)
      • Vars
        • Q(a);CHECK,N_SPINS(b),P_SPINS(e),XR(A)::B(C)+S(F),XQ(a)
        • P(c);CHECK,OGATE,P_SPINP(c),XS(F)::B(C),XP(c)
        • R(h);P_PINQ(E),SBLOCK::B(C)+S(F)
      • Refutation
        • K(d);N_SPINS(b),S_FLIGHT,XS(H)
    • Try
      • P(D);
      • Threat
        • B(C)+S(F)
      • Vars
        • Q(a);CHECK,N_SPINS(b),P_SPINS(e),XR(A)::B(C)+S(F),XQ(a)
        • P(c);CHECK,OGATE,P_SPINP(c),XS(F)::B(C),XP(c)
        • R(h);P_PINQ(E),SBLOCK::B(C)+S(F)
      • Refutation
        • Q(a);N_PINR(A),XP(D)
  • Actual
    • S(H);
    • Vars
      • Q(a);CHECK,N_SPINS(b),P_SPINS(e),XR(A)::B(C)+S(F),XQ(a)
      • P(c);CHECK,OGATE,P_SPINP(c),XS(F)::B(C),XP(c)
      • Q(a);N_PINR(A),XS(H)::R(A),XS(b)
      • P(f);SBLOCK::B(C)+S(F)
      • Q(a);N_PINR(A)::R(A),XS(b)
      • Q(a);N_GUARD,N_PINR(A)::S(H),XQ(a)
      • Q(a);N_PINR(A),SBLOCK::B(C)+S(F)
      • Q(a);N_GUARD::S(H)
      • R(h);P_PINQ(E),SBLOCK::B(C)+S(F)
      • R(h);N_GUARD::R(I),XS(e)
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