MESON Chess Problem Database

Problem Display
PID: 250185 (2KR4/1pQ5/1N2R3/4B3/4k1P1/b7/r1qpn1n1/1B1N4 w - - 0 1)

Vilner, Yakov Semyonovich

Shakhmaty, 1927

2KR4/1pQ5/1N2R3/4B3/4k1P1/b7/r1qpn1n1/1B1N4

#2

9 + 8

6490 yacpdb 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Qxb1
      • 2.Qxb7#
    • 1...Qd3
      • 2.Qxb7#
    • 1...Bc5
      • 2.Qxb7#
  • Tries
    • 1.Bd4+?
      • 1...Kd3
        • 2.Sf2#
        • 2.Qc4#
      • 1...Kf3!
    • 1.Bd6+?
      • 1...Kd3
        • 2.Qc4#
      • 1...Kd4
        • 2.Bxa3#
        • 2.Bb4#
        • 2.Bc5#
      • 1...Kf3!
    • 1.Qxc2+?
      • 1...Kf3
        • 2.Qe4#
      • 1...Rxc2+!
  • Keys
    • 1.Rd3!
      • threat
        • 2.Sf2#
      • 1...Qxc7+
        • 2.Bxc7#
      • 1...Kxd3
        • 2.Qc4#
      • 1...Qxd1
        • 2.Ba1#
        • 2.Bb2#
        • 2.Bh2#
        • 2.Bc3#
        • 2.Bg3#
        • 2.Bd4#
        • 2.Bf4#
        • 2.Bd6#
        • 2.Bf6#
        • 2.Bg7#
        • 2.Bh8#
        • 2.Qxb7#
        • 2.Qh7#
      • 1...Qxd3
        • 2.Qxb7#
      • 1...Se3
        • 2.Rxe3#
      • 1...Qc5
        • 2.Re3#
      • 1...Bc5
        • 2.Qh7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 4
    • REMOVED MATES = 1
  • Sets
    • Q(b);N_PINQ(G),N_SPINQ(b),XB(A)::QAB(G),XP(h)
    • Q(b);N_PINQ(G)::QAB(G),XP(h)
    • B(f);N_PINQ(G)::QAB(G),XP(h)
  • Tries
    • Try
      • B(D);CHECK
      • Refutation
        • K(g);N_SPINQ(b),S_FLIGHT
    • Try
      • B(D);CHECK
      • Vars
        • K(g);N_GUARD,S_FLIGHT::QAB1(G)
      • Refutation
        • K(g);N_SPINQ(b),S_FLIGHT
    • Try
      • Q(G);CHECK,N_SPINQ(G),XQ(b)
      • Vars
        • K(g);S_CUTR(a),S_FLIGHT::QAB1(G)
      • Refutation
        • R(a);CHECK,P_SPINR(a),XQ(G)
  • Actual
    • R(I);N_PINQ(b)
    • Threat
      • S(B)
    • Vars
      • Q(b);CHECK,OGATE,XQ(G)::R(F)+B(D),XQ(b)
      • K(g);P_SPINQ(b),S_CUTS(d),S_FLIGHT,XR(I)::QAB1(G)
      • Q(b);N_PINQ(G),P_SPINQ(b),XR(I)::QAB(G),XP(h)
      • S(e);N_GUARD::R1(I),XS(e)
      • Q(b);::B(A)+R(I),DCHECK
      • B(f);N_PINQ(G)::QAB(G)
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