MESON Chess Problem Database

Problem Display
PID: 229084 (8/5q2/5Pbb/2nPP1rp/R1B1k1p1/2P2RB1/2K1Pp2/7Q w - - 0 1)

Kalina, Vasily Emanuilovich

1st HM., 64 Shakhmatnoe obozrenie, 1926

8/5q2/5Pbb/2nPP1rp/R1B1k1p1/2P2RB1/2K1Pp2/7Q

#2

11 + 9

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Qxd5
      • 2.Bd3#
    • 1...Bf5
      • 2.Rd3#
    • 1...Sb3
      • 2.Bxb3#
    • 1...Sd3
      • 2.exd3#
    • 1...Sb7
      • 2.Ba2#
      • 2.Bb3#
    • 1...Sd7
      • 2.Ba2#
      • 2.Bb3#
    • 1...gxf3
      • 2.Qxf3#
  • Tries
    • 1.Rf5+?
      • 1...Ke3
        • 2.Bxf2#
        • 2.Bf4#
      • 1...Kxf5!
    • 1.Qd1?
      • threat
        • 2.Qd4#
      • 1...Qxd5
        • 2.Bd3#
        • 2.Bxd5#
        • 2.Qxd5#
      • 1...Sb3
        • 2.Bxb3#
        • 2.Qd3#
      • 1...Sd3
        • 2.Qxd3#
        • 2.exd3#
      • 1...Se6
        • 2.Qd3#
      • 1...gxf3!
  • Keys
    • 1.Kd2!
      • threat
        • 2.Rxf2#
      • 1...Qxd5+
        • 2.Bd3#
      • 1...Rxe5+
        • 2.Rf4#
      • 1...Rf5+
        • 2.Re3#
      • 1...Sb3+
        • 2.Bxb3#
      • 1...f1S+
        • 2.Rxf1#
      • 1...Qxf6
        • 2.Rxf6#
      • 1...gxf3
        • 2.Qxf3#
      • 1...f1Q
        • 2.Rxf1#
      • 1...f1B
        • 2.Rxf1#
      • 1...f1R
        • 2.Rxf1#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 7
    • REMOVED MATES = 2
  • Sets
    • Q(i);SBLOCK,XP(I)::R(G)+B(H),DCHECK
    • B(g);SBLOCK::QAB(A)+R(E)
    • S(d);N_GUARD::R(G)+B(H),XS(d)
    • S(d);OGATE::P(C),XS(d)
    • P(c);OGATE,P_SPINP(c),XR(E)::QAB1(A),XP(c)
  • Tries
    • Try
      • R(E);CHECK
      • Refutation
        • K(b);S_FLIGHT,XR(E)
    • Try
      • Q(A);
      • Threat
        • QAR1(A)
      • Vars
        • S(d);N_GUARD::QAB1(A)
      • Refutation
        • P(c);XR(E)
  • Actual
    • K(B);P-FLIGHT
    • Threat
      • QAB(A)+R(E),XP(a)
    • Vars
      • Q(i);CHECK,SBLOCK,XP(I)::R(G)+B(H),DCHECK
      • R(e);CHECK,SBLOCK,XP(J)::QAB(A)+R(E),DCHECK
      • R(e);CHECK,SBLOCK::QAB(A)+R(E),DCHECK
      • S(d);CHECK,N_GUARD::R(G)+B(H),XS(d)
      • P(a);CHECK,OGATE::QAB(A)+R(E),XS(a)
      • Q(i);OGATE,XP(K)::QAB(A)+R(E),XQ(i)
      • P(c);OGATE,P_SPINP(c),XR(E)::QAB1(A),XP(c)
      • P(a);OGATE::QAB(A)+R(E),XQ(a)
      • P(a);OGATE::QAB(A)+R(E),XB(a)
      • P(a);OGATE::QAB(A)+R(E),XR(a)
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