MESON Chess Problem Database

Problem Display
PID: 229040 (7b/8/2nR1P2/4N1Q1/4k3/5ppp/1KN2q2/1B4nr w - - 0 1)

Kalina, Vasily Emanuilovich

64 Shakhmatnoe obozrenie, 1926

7b/8/2nR1P2/4N1Q1/4k3/5ppp/1KN2q2/1B4nr

#2

7 + 9

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Qe1
      • 2.Sxe1#
    • 1...Qe3
      • 2.Sxe3#
    • 1...Qd4+
      • 2.Sxd4#
    • 1...Qb6+
      • 2.Sb4#
    • 1...Qa7
      • 2.Sa1#
      • 2.Se1#
      • 2.Sa3#
      • 2.Se3#
      • 2.Sb4#
      • 2.Sd4#
    • 1...Qxc2+
      • 2.Bxc2#
    • 1...Se2
      • 2.Se1#
  • Tries
    • 1.Sxc6?
      • threat
        • 2.Qg4#
        • 2.Qe5#
      • 1...Qd4+
        • 2.S2xd4#
        • 2.Rxd4#
      • 1...Qb6+
        • 2.S2b4#
      • 1...Qxc2+
        • 2.Bxc2#
      • 1...Qe3
        • 2.Sxe3#
        • 2.Qe5#
      • 1...Qc5
        • 2.Qg4#
      • 1...Qd2
        • 2.Qe5#
      • 1...Se2
        • 2.Se1#
        • 2.Qe5#
      • 1...Bxf6+!
    • 1.Qg6+?
      • 1...Kf4
        • 2.Sd3#
      • 1...Kxe5!
  • Keys
    • 1.Sd7!
      • threat
        • 2.Qg4#
      • 1...Qd4+
        • 2.Sxd4#
      • 1...Qb6+
        • 2.Sb4#
      • 1...Qxc2+
        • 2.Bxc2#
      • 1...Bxf6+
        • 2.Sxf6#
      • 1...Sd4
        • 2.Sc5#
      • 1...Qe3
        • 2.Sxe3#
      • 1...Qd2
        • 2.Sc5#
      • 1...Se2
        • 2.Se1#
      • 1...Se5
        • 2.Qxe5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 1
  • Sets
    • Q(c);N_PINS(C)::B(A)+S(C),XQ(c)
    • Q(c);CHECK,N_PINS(C)::B(A)+S(C),XQ(c)
    • Q(c);CHECK,N_PINS(C)::B(A)+S(C)
    • Q(c);CHECK,OGATE,P_SPINQ(c),XS(C)::B(A),XQ(c)
    • S(a);N_PINS(C)::B(A)+S(C)
  • Tries
    • Try
      • S(D);P_SPINP(G),XS(h)
      • Threat
        • DUALS(2)
      • Vars
        • Q(c);CHECK,N_PINS(C)::B(A)+S(C)
        • Q(c);CHECK,OGATE,P_SPINQ(c),XS(C)::B(A),XQ(c)
        • Q(c);N_PINS(C)::QAR2(E)
        • Q(c);::QAR1(E)
      • Refutation
        • B(i);CHECK,XP(G)
    • Try
      • Q(E);CHECK
      • Vars
        • K(g);P-FLIGHT::S(D)
      • Refutation
        • K(g);P-FLIGHT,XS(D)
  • Actual
    • S(D);P_SPINP(G)
    • Threat
      • QAR2(E)
    • Vars
      • Q(c);CHECK,N_PINP(G),N_PINS(C)::B(A)+S(C),XQ(c)
      • Q(c);CHECK,N_PINS(C)::B(A)+S(C)
      • Q(c);CHECK,OGATE,P_SPINQ(c),XS(C)::B(A),XQ(c)
      • B(i);CHECK,XP(G)::S(D),XB(i)
      • S(h);N_PINP(G),S_CUTQ(c)::S(D)
      • Q(c);N_PINS(C)::B(A)+S(C),XQ(c)
      • Q(c);N_GUARD::S(D)
      • S(a);N_PINS(C)::B(A)+S(C)
      • S(h);N_GUARD,N_PINP(G)::QAR1(E),XS(h)
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