MESON Chess Problem Database

Problem Display
PID: 11756 (1K6/7B/7b/3N4/1P2RP2/1r1k4/1Pnq4/1Q2RN2 w - - 0 1)

Niemeijer, Meindert

Schakend Nederland, 1971

1K6/7B/7b/3N4/1P2RP2/1r1k4/1Pnq4/1Q2RN2

#2

10 + 5

SOLUTION

  • SOUND
  • Sets
    • 1...Qc3
      • 2.R1e3#
    • 1...Qe3
      • 2.R1xe3#
    • 1...Qxb4+
      • 2.Rxb4#
    • 1...Qxf4+
      • 2.Rxf4#
    • 1...Qd1
      • 2.Rxd1#
      • 2.R1e3#
      • 2.Qxd1#
    • 1...Qg2
      • 2.R1e3#
    • 1...Qh2
      • 2.R1e3#
    • 1...Rxb4+
      • 2.Rxb4#
    • 1...Bxf4+
      • 2.Rxf4#
  • Tries
    • 1.Sde3?
      • threat
        • 2.Rc4#
      • 1...Qxb4+
        • 2.Rxb4#
      • 1...Rxb4+
        • 2.Rxb4#
      • 1...Bxf4+
        • 2.Rxf4#
      • 1...Qxe1
        • 2.Qxc2#
      • 1...Qxe3
        • 2.R1xe3#
      • 1...Qg2!
    • 1.Qxc2+?
      • 1...Qxc2
        • 2.R1e3#
      • 1...Kxc2!
    • 1.Qd1?
      • threat
        • 2.Qxd2#
      • 1...Rxb4+
        • 2.Rxb4#
      • 1...Bxf4+
        • 2.Sxf4#
        • 2.Rxf4#
      • 1...Qxd1
        • 2.Rxd1#
      • 1...Sd4!
  • Keys
    • 1.Rd1!
      • threat
        • 2.Rxd2#
      • 1...Rxb4+
        • 2.Sxb4#
      • 1...Bxf4+
        • 2.Sxf4#
      • 1...Qxd1
        • 2.Qxd1#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 1
    • REMOVED MATES = 6
  • Sets
    • Q(b);N_GUARD::R1(B)
    • Q(b);N_GUARD::R1(B),XQ(b)
    • Q(b);CHECK,OGATE,XP(E)::B(I)+R(F),XQ(b)
    • Q(b);CHECK,OGATE,XP(G)::B(I)+R(F),XQ(b)
    • R(c);CHECK,OGATE,XP(E)::B(I)+R(F),XR(c)
    • B(e);CHECK,OGATE,XP(G)::B(I)+R(F),XB(e)
  • Tries
    • Try
      • S(H);
      • Threat
        • B(I)+R(F)
      • Vars
        • Q(b);CHECK,OGATE,XP(E)::B(I)+R(F),XQ(b)
        • R(c);CHECK,OGATE,XP(E)::B(I)+R(F),XR(c)
        • B(e);CHECK,OGATE,XP(G)::B(I)+R(F),XB(e)
        • Q(b);N_GUARD,XR(B)::QAB1(A),XS(a)
        • Q(b);OGATE,XS(H)::R1(B),XQ(b)
      • Refutation
        • Q(b);
    • Try
      • Q(A);CHECK,XS(a)
      • Vars
        • Q(b);SBLOCK,XQ(A)::R1(B)
      • Refutation
        • K(d);S_FLIGHT,XQ(A)
    • Try
      • Q(A);N_PINS(a),P_PINQ(b)
      • Threat
        • QAR1(A),XQ(b)
      • Vars
        • R(c);CHECK,OGATE,XP(E)::B(I)+R(F),XR(c)
        • Q(b);N_SPINQ(b),OGATE,XQ(A)::R(B),XQ(b)
      • Refutation
        • S(a);
  • Actual
    • R(B);P_PINQ(b)
    • Threat
      • R1(B),XQ(b)
    • Vars
      • R(c);CHECK,XP(E)::S(H),XR(c)
      • B(e);CHECK,XP(G)::S(H),XB(e)
      • Q(b);N_SPINQ(b),OGATE,XR(B)::QAR2(A),XQ(b)
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