MESON Chess Problem Database

Problem Display
PID: 229027 (3R1Q2/2pP4/Bpk3P1/8/2N1K2p/1N1P4/p1p3n1/qb1rb3 w - - 0 1)

Neunivako, Pavel Efimovich

Shakhmaty, 1926

3R1Q2/2pP4/Bpk3P1/8/2N1K2p/1N1P4/p1p3n1/qb1rb3

#2

9 + 11

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Qd4+
      • 2.Sxd4#
    • 1...Qe5+
      • 2.Sxe5#
    • 1...Qf6
      • 2.Qxf6#
    • 1...b5
      • 2.Qc5#
  • Tries
    • 1.Sca5+?
      • 1...bxa5
        • 2.Qc5#
      • 1...Bxa5!
    • 1.Qb4?
      • threat
        • 2.Qb5#
      • 1...Qd4+
        • 2.Sxd4#
      • 1...Qe5+
        • 2.Sxe5#
      • 1...b5
        • 2.Sba5#
        • 2.Qc5#
        • 2.Qxb5#
      • 1...Bxb4!
    • 1.Qf5?
      • threat
        • 2.Qe6#
        • 2.Qb5#
        • 2.Qd5#
      • 1...Qd4+
        • 2.Sxd4#
      • 1...Rxd3
        • 2.Qb5#
      • 1...Bg3
        • 2.Qb5#
        • 2.Qd5#
      • 1...Qf6
        • 2.Qb5#
        • 2.Qd5#
        • 2.Qxf6#
      • 1...Bb4
        • 2.Qb5#
        • 2.Qd5#
      • 1...Se3
        • 2.Qe6#
        • 2.Qb5#
      • 1...Sf4
        • 2.Qb5#
      • 1...b5
        • 2.Qe6#
        • 2.Qxb5#
        • 2.Qc5#
        • 2.Qd5#
      • 1...Qe5+!
  • Keys
    • 1.Qf3!
      • threat
        • 2.Kf5#
      • 1...Qd4+
        • 2.Kxd4#
      • 1...Qe5+
        • 2.Kxe5#
      • 1...Rxd3
        • 2.Kxd3#
      • 1...Qf6
        • 2.Qxf6#
      • 1...Se3
        • 2.Kxe3#
      • 1...Sf4
        • 2.Kxf4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 3
    • REMOVED MATES = 1
  • Sets
    • Q(a);CHECK,N_GUARD::S(A),XQ(a)
    • Q(a);CHECK,N_GUARD::S(C),XQ(a)
    • Q(a);N_GUARD::QAR(I),XQ(a)
    • P(i);N_GUARD::QAR1(I)
  • Tries
    • Try
      • S(C);CHECK
      • Vars
        • P(i);XS(C)::QAR1(I)
      • Refutation
        • B(d);XS(C)
    • Try
      • Q(I);
      • Threat
        • QAB1(I)
      • Vars
        • Q(a);CHECK,N_GUARD::S(A),XQ(a)
        • Q(a);CHECK,N_GUARD::S(C),XQ(a)
      • Refutation
        • B(d);XQ(I)
    • Try
      • Q(I);
      • Threat
        • DUALS(3)
      • Vars
        • Q(a);CHECK,N_GUARD::S(A),XQ(a)
        • R(c);XP(B)::QAB1(I)
        • S(g);::QAB1(I)
      • Refutation
        • Q(a);CHECK
  • Actual
    • Q(I);
    • Threat
      • QAB(I)+K(D)
    • Vars
      • Q(a);CHECK::QAB(I)+K(D),XQ(a)
      • R(c);XP(B)::QAB(I)+K(D),XR(c)
      • Q(a);N_GUARD::QAR(I),XQ(a)
      • S(g);::QAB(I)+K(D),XS(g)
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